Xiaomi Mi Band 2

The Xiaomi Mi Band 2 is a low cost, wearable activity tracker produced by Xiaomi. It was released on 7 June 2016. Unlike its predecessor, the Xiaomi Mi Band 2 comes with an OLED screen and a capacitive button. In September 2017, Xiaomi released an ultra low-cost version of the Mi Band 2, titled "Mi Band - HRX Edition"

On 31 May 2018, Xiaomi released the Mi Band 3, the successor to the Mi Band 2.

Specifications
=== General ===
 * Brand: Xiaomi
 * Bluetooth version: V4.0 BLE (Chinese version), V4.2 BLE (International version)
 * Waterproof Rating: IP67
 * Color: Black
 * Compatibility: Android 4.4 + / iOS 7.0 +
 * Language: English / Chinese / Multilanguage
 * Total length: 235 mm
 * Adjustable length: 155–210 mm
 * Product size (L x W x H): 40.3 x 15.7 x 10.5 mm
 * Product weight: 7.0 g

Sensors

 * Accelerometer
 * Optical Heart Rate Monitor
 * Vibration Engine

Display

 * Display: 0.42 inch OLED
 * Button: Capacitive

Battery

 * Battery type: Lithium Polymer battery
 * Battery capacity: 70 mAh
 * Battery Life: 10–30 days
 * Input current: 45 mA (TYP), 65 mA (MAX)
 * Input voltage: DC 5V

Material

 * Front Display Material: Makrolon polycarbonate
 * Case material: TPSiV Thermoplastic copolyester
 * Band material: Thermoplastic elastomer
 * Band Clasp Material: Plastic