Product descriptionColor: blackwhiteredBluetooth: 4.2Transmission frequency : 2.4GHz (2.402-2.480GHz)Transmission distance: 10MSpeaker sensitivity: 1205dBFrequency response : 20-20kHzPlay time: about 6-8hCharging time : about 1.5hPackage content: 1*wireless mini earphone1.NON EAR PLUG DESIGN - Upgraded headphone version is the Ear-hook design, not in-ear, free from eardrum damage. 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.SPEAKER UNIT IS EXTERNAL - 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.Suitable for 2 ears - Suitable for the left and right ears, The ergonomic structure is adopted, and the smooth body curve is tightly attached to the ears, so that the ears are evenly
