Stereo Bluetooth headphones Technical Technical standards: Bluetooth version V2.0 Chipset: BlueCore3-Multimedia single-chip Applicable models: support for headsets and hands-free Bluetooth mobile phone models Power Transmission: Class2 Radio frequency: 2.4 GHz-2.480GHz Receiver sensitivity: <-75dBm Transmission: 10 m Power specifications Chargers Power: INPUT 100-240VAC OUTPUT 5VDC Voltage: 3.7V Power Built-in rechargeable lithium batteries Charging time: 2-3 hours Talk time: 5 hours Standby time: 150 hours Appearance specifications Blister pack size: 224 × 120 × 55 mm Single headset size: 50 × 23 × 18 mm Single headset weight: 17 g