What Is Bluetooth 5.3 and Why Does It Matter for Your Smartwatch?

If you have been shopping for a smartwatch recently, you have almost certainly come across Bluetooth 5.3 listed in the spec sheet. But what does that actually mean in practice? Is it a meaningful improvement over older Bluetooth versions? And should it influence your buying decision? In this guide we will cut through the tech jargon and give you a clear, practical answer to every Bluetooth question you might have about your next smartwatch.

A Brief History of Bluetooth in Wearables

Bluetooth has been the wireless standard for connecting wearables to smartphones since the very beginning of the smartwatch era. But the technology has evolved considerably over the years, and each major version brought meaningful improvements.

Bluetooth 4.0, 2010, introduced Bluetooth Low Energy, BLE, which was the breakthrough that made battery-powered wearables practical. Without BLE, a smartwatch running Bluetooth would drain its battery in hours rather than days.

Bluetooth 4.2, 2014, improved speed, data capacity, and security over 4.0. This became the baseline standard for early fitness trackers and smartwatches entering the consumer market.

Bluetooth 5.0, 2016, a major leap: doubled the speed, quadrupled the range, up to 400 metres in ideal conditions, and significantly increased broadcast capacity. This enabled smoother, more reliable connections between watches and phones.

Bluetooth 5.1, 2019, added direction-finding capability, enabling more precise location detection, though this has limited direct relevance for most consumer wearable use cases.

Bluetooth 5.2, 2020, introduced LE Audio, which improved audio quality and power efficiency for wireless audio devices. Also brought enhanced attribute protocol improvements relevant to data transfer efficiency.

Bluetooth 5.3, 2021, the current standard, bringing improvements to connection stability, power efficiency, and periodic advertising, all of which have real benefits for smartwatch users specifically.

What Is New in Bluetooth 5.3?

Bluetooth 5.3 introduced several technical improvements over 5.2. Here are the ones that matter specifically for smartwatch users.

1. Enhanced Connection Subrating

One of the headline improvements in Bluetooth 5.3 is a feature called connection subrating, which allows a device to switch between different connection intervals more efficiently. In practical terms, this means your smartwatch can maintain a low-power background connection with your phone and then rapidly switch to a faster, high-bandwidth connection when it needs to sync data, all without you noticing.

The result is better battery efficiency during background operation, and faster data syncs when you actually need them. Your daily step count, heart rate history, and sleep data sync to your app more quickly, with less drain on the watch battery throughout the day.

2. Improved Periodic Advertising With Responses

This is a technical change that improves how Bluetooth devices broadcast information and respond to other devices. For smartwatch users, the practical benefit is more efficient background communication between the watch and phone, less power wasted on handshaking and connection maintenance, more available for the features you actually use day to day.

3. Better Connection Stability in Crowded Environments

Bluetooth 5.3 includes improvements to how devices handle interference from other wireless signals, Wi-Fi networks, other Bluetooth devices, and RF interference from appliances. In a busy office, gym, or public space with dozens of wireless devices, a Bluetooth 5.3 smartwatch will maintain a more stable connection to your phone than an older device using 5.0 or 5.2.

This might seem like a minor point, but if you have ever experienced your smartwatch randomly disconnecting from your phone and missing notifications as a result, this improvement is directly relevant to that frustration that many wearable users have experienced at some point.

4. Enhanced Encryption

Bluetooth 5.3 improves the security of LE, Low Energy, connections by offering enhanced encryption options. Your health data, heart rate readings, sleep patterns, activity metrics, is transmitted between your watch and phone with stronger security protections against interception by unauthorised devices.

In everyday life, this is unlikely to be something you will ever think about. But knowing your personal health data is better secured during transmission is quietly reassuring for anyone who values data privacy.

Does Bluetooth 5.3 Make a Noticeable Difference in Real Life?

Let us be honest: the difference between Bluetooth 5.2 and 5.3 is real but subtle. You will not put on a Bluetooth 5.3 smartwatch for the first time and think wow, this is completely different to my old watch. The improvements are evolutionary rather than revolutionary in nature.

What you will notice over time is fewer connection dropouts, particularly in busy wireless environments, slightly faster data syncing to the companion app, marginally better battery efficiency over the course of a day, and a more consistently stable connection between watch and phone throughout daily use.

The bigger leap was from Bluetooth 4.x to 5.x, that is where the fundamental improvements in range, speed, and power efficiency occurred. If your current watch uses Bluetooth 5.0 and you are considering upgrading primarily for Bluetooth 5.3, that alone would not be sufficient reason. But if you are choosing between two otherwise similar watches and one has 5.3 while the other has 5.0, the 5.3 device is the better, more future-proofed choice.

Bluetooth 5.3 vs Other Bluetooth Versions: Quick Comparison

Which COLMI Smartwatches Use Bluetooth 5.3?

Several COLMI smartwatches already feature the latest Bluetooth 5.3 standard: COLMI i28 Ultra, 42.28 GBP, AMOLED display with 6 colour options and BT 5.3; COLMI V73, 34.73 GBP, stylish AMOLED watch available in Rose Gold, Gold, and Black with BT 5.3; COLMI V75 GPS, 44.75 GBP, built-in GPS with AMOLED and BT 5.3; COLMI V76 GPS, 57.76 GBP, 7-day battery AMOLED GPS watch with BT 5.3; COLMI P81, 33.81 GBP, 1.9-inch IPS display with voice calling and BT 5.3; COLMI P82, 47.82 GBP, large 2.13-inch AMOLED with GPS and BT 5.3; COLMI P86, 44.86 GBP, curved AMOLED display with BT 5.3; and COLMI V89, 48.89 GBP, premium V-series AMOLED with BT 5.3.

COLMI models using Bluetooth 5.0, which is still an excellent standard, include the V69, M42, V72, and C8 Max.

Does Your Phone Bluetooth Version Matter?

Yes, but it will not cause compatibility issues. Bluetooth is backward compatible, meaning a Bluetooth 5.3 smartwatch will work perfectly with a phone running Bluetooth 5.0, 5.2, or any other version. The connection simply defaults to the capabilities of whichever device has the older standard.

To get the full benefits of Bluetooth 5.3, both your watch and your phone need to support it. Most modern smartphones released after 2022 support Bluetooth 5.2 or 5.3, so this is increasingly a non-issue for newer phone owners across the market.

Should Bluetooth Version Be Your Primary Buying Criterion?

Honestly, no. Bluetooth version is a useful tiebreaker between otherwise similar watches, but it should not be the primary driver of your decision. Features that will have a much bigger impact on your daily experience include display type and quality, AMOLED vs IPS has a noticeable effect on how enjoyable the watch is to look at every day, battery life, the difference between 5 days and 14 days of battery matters enormously in practice, GPS, if you run or cycle outdoors, built-in GPS is a meaningful feature, health features, the specific sensors and monitoring capabilities the watch offers, and design and colour options, you are going to wear this every day, so it should look good on your wrist.

Bluetooth 5.3 is the icing on the cake, a welcome inclusion that delivers real, if subtle, benefits, but not a feature worth compromising on the things that matter more for daily use.

Final Thoughts

Bluetooth 5.3 represents a genuine incremental improvement over previous versions, better connection stability, lower power consumption, faster data syncing, and enhanced security. For smartwatch users, these improvements translate to a slightly more reliable and efficient daily experience. It is a welcome feature in any modern smartwatch, and the fact that COLMI includes it across a growing portion of their lineup at accessible price points is a positive sign for the brand's ongoing commitment to current technology standards.

Browse the full COLMI smartwatch range to find your perfect match, whether that is the latest Bluetooth 5.3 connectivity, AMOLED display quality, GPS capability, or the longest battery life in class.