Updated : Rechecked the three original models, removed old sale prices and corrected the buying and water-resistance advice.
The Amazfit Bip 5 Unity, Cheetah and original T-Rex Ultra suit different jobs. The Unity is the simpler everyday option, the Cheetah focuses on running, and the T-Rex Ultra is built for outdoor use. These are older models, so compare the exact product, condition and warranty before treating a discount as a good deal.
Which of these three Amazfit watches fits you?
| Watch | Main reason to consider it | Important limit |
|---|---|---|
| Bip 5 Unity | A large screen, notifications and Bluetooth calls | Route tracking needs your phone; it has no built-in GPS |
| Cheetah, original round model | Built-in dual-band GPS and running tools | Map and route features need setup in Zepp; this is not the newer Cheetah 2 range |
| T-Rex Ultra, original model | A rugged body, GPS and outdoor navigation tools | It is larger than a basic fitness watch; do not confuse it with the Ultra 2 |
Bip 5 Unity: check the missing GPS first
The Unity is worth a look if you mainly want calls, notifications and everyday activity tracking. Its 1.91-inch screen gives you more room to read than a narrow fitness band. Bluetooth calling still needs a nearby connected phone; the watch does not replace a mobile plan.
The key trade-off is GPS. Unlike some similarly named Bip watches, the Unity relies on the phone for route data. Check the exact name on the box and the Bip 5 Unity support guide. A listing for a Bip 5 or Bip 6 is a different product.
Cheetah: look for the exact running features you need
The original Cheetah Round has dual-band positioning and supports offline maps. Download the right map and prepare a route before you leave. An offline map does not mean you can pick any destination on the watch and get phone-style directions.
Choose it for the running tools you will use, rather than a claim that GPS is always perfectly accurate. Trees, buildings and how you wear the watch can still affect a route.
T-Rex Ultra: rugged does not mean damage-proof
The original T-Rex Ultra has a 10 ATM water-resistance rating. That is not a promise that every water activity or every real-world depth is safe. Follow the model’s manual, especially for diving, hot water and high-pressure water. Our guide to water-resistance ratings explains why a rating needs test conditions.
Check these things before buying an older watch
- Confirm the exact model and whether it is new, refurbished or used.
- Check the current Zepp app requirements for your phone.
- Look for a clear return policy, local warranty and a working original charger.
- Allow for battery wear; advertised battery life uses specific test settings.
- Compare the total price with newer models available in your country. The old prices in this guide are no longer reliable.
If you already own one, start with our Amazfit pairing and connection fixes. If overnight data is your priority, compare the limits in our sleep-tracking smartwatch guide before buying.