3.81 cm (1.5") , AMOLED , Brightness 3000 cd/m² , Display type Digital , Display resolution 480 x 480 pixels , Touchscreen Yes , RAM capacity 64 MB , Flash memory 4 GB , Band material Silicone , Band size One Size , Shape Round , Market positioning Smartwatch , Watch case colour Black , Watch case material Aluminium,Plastic , Band colour Black , Heart rate monitor Yes , Near Field Communication (NFC) Yes , Bluetooth version 5.3 , Battery type Built-in battery , Battery technology Lithium Polymer (LiPo) , Battery capacity 658 mAh , Battery life 24 day(s) , Charging time 2 h