Product descriptionColor: blackwhiteredBlue: 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 earphoneFirst use of connection: Long press the power button for more than 5 seconds,until the blue and red lights flash alternately. It works very well and connects easily the first time and then every time after, it connects automatically.Ear-hook design, not in-ear, free from eardrum damage. Instead of bone conduction headphones, no need to vibrate ear bones, more comfortable and very light, painless wearing and not irritate your ear. in long time use, latest concept ergonomics design fully fit outside the auricle.The left or right ear can be worn.The Blue headset can also match most Blue devices. Within 10 meters, you can enjoy music and the signal connection is stable. Compatible IOS, android, wp system, as long as the devices have Blue, it can be used.Built-in high performance lithium battery, 6-8 hours continuous answer phone, about 6 hours music playing time, 150 hours standby time, 1 to 2 hours quick charge.The headphones battery status will be automatically displayed on the IOS cellphone screen. It helps you to understand the power situation faster.It is light and comfortable when wearing.You maybe can barely even feel it on. The sound is good. Can hear music as well the the surroundings. It fits nice and comfy, especially for someone who doesn't like things in her ears or squishing them. This is the perfect solution