This is Bluetooth 4.0+ HSP+HFP+AVRCP+EDR+A2DP wireless bluetooth headphone---The Newest advanced bluetooth 4.0 technology(8 times the bandwidth compare over the bluetooth 2.1 standard); This earphone can work well with Iphone 6S/6/6PLUS/5s/5c/5/4s/4/3/2; ipad series/ipod/itouch; Samsung Galaxy S6/S5/S4/S3/S2/Note2/Note3/Note4/Galaxy all Tablet/Nokia/HTC/aTT/Toshiaba/Sony all Smart phone and All Tablet/PC/Laptop. Specification: *Product Model: BT508 *Supports Bluetooth V4.0 *Supports profile A2DP *Frequency response: 20Hz-20KHz *Sensitivity: 120db±3db *SNR: ≥93DB *Distortion: 0.4％ *Digital volume control *Built in Mic-phone *Driver: 33 feet *Micro USB port for battery recharge *Wireless range: 33 feet *DC battery power: built-in rechargeable lithium battery *Battery life: 6~7 hours talking or Listen music time; Standby time 100 hours; *Includes: 3 sets of eartips: 1 small, 1 medium, 1 large 　Package details: 1 x Bluetooth headset 1 x USB charging cable 1 x 3 sizes ear tips: (1 small, 1 medium, 1 large) 1 x User Manual 1 x 2 sets of stablilizers 1 x 2 detachable earhooks How to Connect the Headphones with Your Cellphone（for the first time): 1 step: long press Power button to turn on, you can see the blue light,BUT DON'T STOP PRESS,UNTIL THE RED AND BLUE LIGHT APPEAR ALTERNATELY; 2 step: open related Bluetooth device,to click scan to search related device. After scanning, waiting for the device of BT-508. 3 step: choose BT-508 Bluetooth headset to connect and get paired among the scanned devices. BT-508 will make the sound of connecting successfully. 4 step: Bluetooth device will play when successfully paired, when the blue light slow flash.Beyution