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Specifications: Brand: Xiaomi Model: Mi Band 4 Colour: Black Waterproof grade: 5ATM Screen type: AMOLED Screen size: 0.95" Screen resolution: 120x240 RGB Screen color: 24bit Screen Backlight: Maximum Brightness > 400nit, Adjustable Brightness Touch Screen: On Cell Dual Point Mutual Capacitance Cover Material: 2.5D Reinforced Glass + AF Coating Key: 1x touch button (wake up, return) Payment: support for Alipay QR code payment Wristband type: removable Wrist bandwidth: 18mm Wristband material: TPU Wristband length: 155-216mm/6.10-8.50" Memory: 512KB Flash memory: 16MB Connection: BT5.0 BLE Charging mode: 2Pin Pogo Pin Charging time: 20 days Product weight: 22.1g Product size: 46.9x17.9x12mm/1.85x0.70x0.47" Notes: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools. 2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Included: 1 X Host 1 X Charging Line 1 X User Manual (English Version)