Balance 2 , AMOLED , 3.81 cm (1.5") , Brightness 2000 cd/m² , Display type Digital , Display resolution 480 x 480 pixels , Touchscreen Yes , Watch glass type Sapphire , RAM capacity 3 MB , Band material Silicone , Band size M , Shape Round , Market positioning Smartwatch , Watch case colour Grey , Watch case material Aluminium,Glass Fiber Reinforced Polymer (GFRP) , 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 capacity 668 mAh , Battery life 21 day(s) , Charging time 2 h , Weight 43 g