Description: 1.F88 headphone version is the Ear-hook design, not in-ear, free from eardrum damage. Only weight for 8g and easy to carry, suit for all peoples, do not fall when running. Wear in left or right ears, with glasses is ok. With Built-in microphone is for Hands-free calling. 2.Loudspeaker close to the ear but it is not inside the ear, will not plug block the ear canal. Listening to the surrounding environment during a call or music, Safer on the road or in some scenes and more portable for business, work. 3. 0.35OZ weight, very light, no pressure or pain feeling in long time use. Wireless headphone affixed to the ear, suit for all peoples, do not fall when running or driving. 4.EASY TO CONNECT - 1) Enter Pairing mode: Long (Keep) press MFB button(about 3 seconds) till (pass by blue light flash three times with voice “power on”) till the blue light and red light flashing alternatively and hearing voice “paring”. 2) Find the bluetooth name “F88-TWS” on your phone and click it, after success, you will hear the voice “connected” 5.IPX5 water and sweat resistant, without fear of sweat. Specification: Wireless version: V5.0 EDR Transmission distance: 10M Speaker sensitivity: 120±5dB Frequency response : 20-20kHz Standby time : about 200 h Play time: about 10h Charging time : about 1.5h Battery: 140 mAh lithium battery (included) Size:72mm x 40mm x 8.5mm Package Includes: 1x F88 headset 1xUSB charging cable 1x manual