Bluetooth wireless stereo music eye mask， it can connect to the mobile phone which support Bluetooth or has Hands free Bluetooth protocol and other portable devices which support AVRCP. Before using stereo Bluetooth music eye mask to answer the calls， please first finish the pairing of Bluetooth eye mask with Bluetooth mobile phone or other Bluetooth device， according to the opreation specification under below.Function:1 Music Player2 call volume adjustment3 make and answer calls4 the use of mobile phone keypad dialing5 number redial to the last phone call6 To answer incoming calls7 Hunging up8 Reject the phone callThe product specification:Bluetooth protocol: Bluetooth 4.1+EDR including ESCO and AFHPower standard: Class 2The communication distance: 10MBandwidth: 2.4GHZ (2.402-2.483.5MHZ)Emission sensitivity: about 4dBmThe receiver sensitivity: -92dBmHorn parameters: 30mm 32 euro 0.25W*2MIC distance: about 1mThe signal-to-noise ratio of SNR: 98dBLED indicator: power / to code / chargeContinuous play time: 5--6 hoursWorking current: 10--25mACharging time: about 2 hours (please full charge before first use).Range of working temperature: -10-50 degreesOperating humidity range: 10-90%Operation Guide:Press the on/off button till the LED light blink 5s， turn from blue to red.Open the Bluetooth in phone and match with the device "Sound Sleep"After match successfully open the music in your phone， then you can enjoy the music with the eye mask， press the on/off button can pause itPress the on/off button， you can answer the phone. press again for hang up Long press the Forward button for volume +， long press the Back button for volume .Press on/off button 2-3 seconds can back to dial the telephoneWhen charging the red light on， while charging is complete， the red light will off.Note:During use ， please make sure that the distance between stereo Bluetooth music mask and your mobile phone or other Bluetooth device is less than 10m; if there have walls and other obstacles in between， communication distance will be reduced accordingly.