Bluetooth version: Bluetooth V2.1 + EDR - TF card support and Bluetooth wireless communication functions - Supports MP3 format music - Interfaces: 2.5mm audio + TF slot - Built-in rechargeable 300mAh li-ion battery - Continuous talking time: about 11 hours - Music playing time: about 6 hours - Standby time: about 180 hours - Transmission range: 10m - Frequency range: 2.4~2.483GHz - Support mobile phone/PDA/notebook/MP3/4/5 etc. - Package included: - 1 * Bluetooth headphone - 1 * USB charging cable (2.5mm port) - 1 * 2 pin round plug (input: 100V-240V output: DC5.0V