1.Drive:15mm 2.Impedance: 32 OHM 3.Bluetooth Version: Bluetooth V4.1+EDR 4.Bluetooth Frequencyï¼2.4Hz 5.Power Gradeï¼Class II 6.Output Powerï¼30mW 7.Bluetooth Distance: 15 metersaccessible 8.FrequencyResponse:20-20000Hz 9.Operating Voltage Range:3.0V-4.2V 10.Microphone Sensibilityï¼-42dB 11.A2DP/AVRCP High Quality Stereo Audio Transmission and Remote Control Protocol 12.Intense Noisy Cancellation Circuit 13.Switch Between Chinese and English(when the phone is not connected to the Bluetooth, press the switch twice to hear the tone switch successfully) 14.Charge for approximately for an hour( Power Indication:red light, full charge; blue light, the red light disappear) 15.Product Size: Length 25mm*Width15mm*Height35mm 16.Product Weight: 6 g 17.Call Duration: About 2-3 Hours 18.Music Duration: About 2-3 Hours 19.Standby Timeï¼About 96 Hours 20.Charging Time: 60 Minutes 21.Battery Capacity: 55MAH 22.Power:DC 5V(Round Hole Interface), USB Port,Cellphone Charger, Car Charger. 23.The Weight of Whole Set: 60g 24.Package Dimension: 9.583.5*13cm 25.Including: Earphones+USB Cable+Manual+Package Box