Xiaomi Mi Smart Band 4

The Xiaomi Mi Smart Band 4 (Xiaomi Mi Band 4 in China) is a wearable activity tracker produced by Xiaomi Inc released in China on 16 June 2019, in Europe on 26 June 2019 and in India on 19 September 2019. It is 39.9% larger than its predecessor, has a super capacitive AMOLED display and features 24/7 heart rate monitoring.

Specifications
Specifications:


 * Display: 0.95 inch AMOLED, full color touch screen;
 * Colour depth: 24bit;
 * Screen brightness: Up to 400 nits;
 * Resolution: 120 x 240;
 * Button: Single touch button (wake up, go back);
 * Connectivity: Bluetooth version 5.0 BLE; NFC on some models;
 * Mass: 22.1 g;
 * RAM: 512KB;
 * Storage: 16MB:
 * Battery: LiPo, 135mAh, 20 days of battery life;
 * Sensors: accelerometer, gyroscope, PPG heart rate sensor, capacitive proximity sensor;
 * Waterproof: up to 50 metres, 5 atmospheres