Bluetooth version V3.0+EDR Frequency response: 2.4-2.4835GHz ISM band Range TF card supported: 128M-32GB Distance: 10/20m Sensitivity: -80dBm Mp3&FM sepcification Music format supported: MP3/WMA Slot: USB 2.0 FM radio range supported: 87.5-108.0MHz Driver unit: 40mm Diameter Bettery capacity: 250mAh Specification Headphone Driver unit.40 Sensitivity: 115db S.P. L. at 1kHz Impedance: 320HM Mic unit: 4mm 1.5mm-42dB Rater power: 40mw Frequency range: 20Hz-20kHz Plug type: 3.5mm stereo