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
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.
eBay
Magnetic Folding Buckle Band for C21 Smart Watch Silicone Strap for C21 Smart Watch Watchband Bracelet
Aliexpress UK
⚠ [Note] ① Since the watch is equipped with speakers and microphones, it is not waterproof. The watch is now equipped with more than 20 functions and each function is effective, these functions are very useful for daily use or exercise.
eBay
Smart Watch Multi-functional sports smart watch men's and women's sports watch, compatible with Android and iPhone
Aliexpress UK
Bluetooth LE 5.0+calls. Waterproof grade: IP68. 1x smart watch. Watch strap material: silicone tape, belt. watch, wristband, instruction manual, charging cable. Watch strap color: silicone tape: black, blue, pink, white Belt black leather, brown leatherWatch supports.
eBay
Watch Box Organizer for Men or Women，Watch Travel Case Portable Storage Watch Display Holder for Wristwatches and Smart Watches
Aliexpress UK
Bluetooth: BT4.0. Answer/reject calls/make calls, heart rate monitoring, blood/oxygen pressure monitoring, sleep monitoring, sedentary reminder. 1x Smart watch. Looking forward to our every cooperation.
eBay
Leather Strap Watchband for C21 Smart Watch Smart Wriststrap Quick Releas Bracelet for C21 Smart Watch Accessories
Aliexpress UK
Water-resistance grade of IP68, you can swim with your smartwatch without worry, built-in over 100 sports modes, use with "Very Fit" app, Get clear and insights into your health with 24/7 heart rate monitoring, sleep analysis, stress detection.
eBay
Mesh Watch Band for C21 Pro Smart Watch Bracelet Wrist Strap Loop for C21 Pro Smart Watch Watchband Accessories
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
Mesh Watch Band for C21 Smart Watch Bracelet Wrist Strap Loop for C21 Smart Watch Watchband Accessories
Aliexpress UK
【NFC Function】The new function NFC is online, imitating the access card and lifting the wrist to open the door. OTA firmware upgrade. Bluetooth: Dual Bluetooth 5.0. Waterproof Level: IP67. -1x Smart watch.
eBay
Watch Bracelet Strap for C21 Smart Watch Smartwatch Stainless Steel Band for C21 Smart Watch Metal Correa Wristband
Aliexpress UK