bluetooth version: 5.3 (headphones) bluetooth version: 5.0 (watch) Waterproof grade: IP67 Watch/charging compartment battery capacity: 250mAh polymer lithium battery Headphone battery capacity: 30mAh polymer lithium battery, headphone charging time: 1 hour Charging case function: The main body can charge the earphones 2-3 times, standby time: 15 days Music time: about 4-5 hours, charging method: magnetic charging, watch charging time: 2 hours Operation mode: full screen touch+buttons, vibration: real-time vibration reminder Compatible system: Android 7.0 and above versions; IOS 11 and above versions Application: Heylink Shell material: glass lens+zinc aluminum alloy Watch strap material: TPU tape/steel strap Package include: 1*2-in-1 smartwatch 1 * User manual 1 * Magnetic suction charging wire Attention: 1.Due to manual measurement, please allow an error of 1-3cm. Before bidding, please make sure you don't mind!! 2.Due to differences in different monitors, images may not reflect the actual color of the product