https://jingyuniot.en.made-in-china.com/product-group/TMNtJnIlVuYe/S320B-1.html
S320B - Shenzhen Jingyun Iot Technology Co.,Ltd - page 1.
China S320B catalog of Bt Call 3ATM Waterproof OEM ODM S320b SKD Custom Manufacturer Sport Compass Smart Watch Square Smart Watch, Compass Square Full Touch...
iot technologyshenzhencoltd