Specification: Model:F23 bluetooth Chip : 5.0 Material:ABS+ Plating CPU frequency: 96MHZ Working voltage: DC 2.2V-5.5V Signal to noise ratio: ≥92dB Effective distance: barrier-free 10M Frequency response scope: 20HZ-20KHZ Sensitivity: 98dB Nominal impedance: 32Ω Waterproof level :IP45 Transmission power: Class 2 Headphone battery capacity: 50 mAh Charging battery capacity: 400 mAh Charging time: about 1-2 hours Hours of use: 3 hours of talk and 3 hours of music playback Standby time: 120 hours Weight: about 35g Supporting Agreement:HEPHSPA2DAVRCP Support language: English