Balance 3 , AMOLED , 3.81 cm (1.5") , Brightness 3000 cd/m² , Display type Digital , Display resolution 480 x 480 pixels , Touchscreen Yes , Watch glass type Sapphire , Operating system installed Zepp OS , Flash memory 64 GB , Band material Silicone , Band size One Size , Shape Round , Market positioning Sport watch , Watch case size 51 mm , Watch case colour Black/Titanium , Watch case material Titanium , Band colour Black , Heart rate monitor Yes , Near Field Communication (NFC) Yes , Wi-Fi Yes , Bluetooth version 5.2 , Battery type Built-in battery , Battery life 21 day(s) , Weight 55 g