Armband activity tracker Rectangle Black Touchscreen 3.99 cm (1.57") AMOLED 256 x 402 pixels Heart rate monitor Pedometer Hours slept Quality of sleep Personal goals Waterproof Bluetooth 5.2 200 mAh Battery life: 14 day(s) Performance ROM capacity 128 MB Colour display Yes Touchscreen Yes Display resolution 256 x 402 pixels Display diagonal 3.99 cm (1.57") Display type AMOLED Design Country of origin China Waterproof up to 50 m Water resistance 5 ATM Waterproof Yes Minimum strap length 13 cm Maximum strap length 21 cm Band material Silicone Housing material Glass, Polycarbonate (PC) Product colour Black Form factor Rectangle Device type Armband activity tracker Features Blood oxygen sensor Yes Personal goals Yes Quality of sleep Yes Hours slept Yes Multisport mode Yes Pedometer Yes Heart rate monitor Yes Heart rate sensor type Optical Ports & interfaces Near Field Communication (NFC) No Wi-Fi No Bluetooth version 5.2 Bluetooth Yes Power Charging time 1 h Battery capacity 200 mAh Wirele