Description: 1. Superior material improve strength and durability. Professional precise movement provide accurate time keeping. 2. Delicate appearance, idea gift for your friends.This product is very beautiful and very suitable as a gift for family members or friends. Specifications: Screen size: 1.57 inch long screen Resolution: 200×320 System requirements: for Android 5.0 and above, for IOS 11 and above, support wireless5.0 Wireless version: wireless5.0 Main control chip: RTL8762CK Heart rate chip: original phase 8007 Battery capacity: 200mAh Memory: RAM160KB + ROM64MB Charging method: magnetic charging Motor: built-in, vibration reminder Waterproof rating: IP68 Material: zinc alloy + plastic Sensor: Three-axis sensor Watch size: -46*30*9.5mm Strap width: 20mm Package Included: 1 pc * Watch Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.