The body is available in four colors: black, grey, gold and blue. Even while swimming. The watch has a Bluetooth 5.1 function with BLE low energy consumption technology. screen function, ultra-low power consumption and long endurance.
eBay
Watchband for C21 Smart Watch Swim Strap Smart Watch for C21 Smart Watch Silicone Soft Breathable Sports Bracele
Aliexpress UK
The body is available in four colors: black, grey, gold and blue. Even while swimming. The watch has a Bluetooth 5.1 function with BLE low energy consumption technology. screen function, ultra-low power consumption and long endurance.
eBay
Magnetic Folding Buckle Band for C21 Smart Watch Silicone Strap for C21 Smart Watch Watchband Bracelet
Aliexpress UK
Walking, Basketball, Volleyball, Running, Table Tennis, Cycling, Tennis. Bluetooth：Version Ble 5.0. System：Android 5.1 And Above, Ios 8.2 And Above, Support.
eBay
Watch Box Organizer for Men or Women，Watch Travel Case Portable Storage Watch Display Holder for Wristwatches and Smart Watches
Aliexpress UK
eBay
Leather Strap Watchband for C21 Smart Watch Smart Wriststrap Quick Releas Bracelet for C21 Smart Watch Accessories
Aliexpress UK
Sensor：Gravity Sensor 3 axis. The USB head is inside the strap, no charging cable, the strap can be removed, and the USB head is on the side of the head. It can be inserted in the charging head. 1 x Smart Watch.
eBay
Mesh Watch Band for C21 Pro Smart Watch Bracelet Wrist Strap Loop for C21 Pro Smart Watch Watchband Accessories
Aliexpress UK
Triaxial Acceleration Sensor The TFT technology ensures a bright display that remains readable under different lighting conditions, including direct sunlight. This technology ensures a stable and efficient connection with minimal power consumption.
eBay
Mesh Watch Band for C21 Smart Watch Bracelet Wrist Strap Loop for C21 Smart Watch Watchband Accessories
Aliexpress UK
Record, heart rate, blood pressure, sleep, exercise. Bluetooth: 4.0. Introduction to watches：. Information reminder. alarm clock, photo, raised wrist screen, sedentary reminder, stopwatch, countdown.
eBay
Watch Bracelet Strap for C21 Pro Smart Watch Smartwatch Stainless Steel Band for C21 Pro Smart Watch Metal Correa Wristband
Aliexpress UK
The body is available in four colors: black, grey, gold and blue. Even while swimming. The watch has a Bluetooth 5.1 function with BLE low energy consumption technology.
eBay
Nylon Loop Strap for C21 Smart Watch Smartwatch Replacment Bracelet Sport Watchband Correa for C21 Smart Watch Band
Aliexpress UK