Product size: 1.5cm*2.3cm Charging box size: 11cm*3.3cm Weight: 4 grams (excluding the weight of the charging box) Color: Obsidian Black, Haoxue Silver, Tyrant Gold, Rose Gold, Wine Red Bluetooth solution: V5.0 Support protocol: HSP/HFP/A2DP/AVRCP Operating distance: 10M Talk time: 3-4 hours Music playback time: 3-4 hours Battery type: polymer lithium battery Battery voltage: 3.7V Headphone battery capacity: 50mAh Charging box battery capacity: 550mAh Headphone charging time: 40-50 minutes Sensitivity: 120±5db Frequency response: 20-20000HZ Impedance: 32Ω