Description:Music playback/power on/power off/voice assistant calling/volume adjustment/answering and rejecting incoming calls can be achieved by the functional buttons of this earphone.To avoid damaging your eardrum and protect hearing, this earphone adopt bone conduction technology so you don't need to insert the earphones into your ears.Made of ABS material, it is durable and reliable to use. It supports for iOS battery display, automatic back connection, calling for Siri voice assistant and call reporter.The length of the product is 6.7cm, the width is 5.2cm, the height is 1cm.It is suitable for sports, business, driving, etc.Item Name: Bone Conduction Bluetooth-compatible EarphoneMaterial: ABSModel: M-618Bluetooth-compatible Version: 5.1Bluetooth-compatible Distance: about 15mSpeaker: Bone Conduction Vibrator SpeakerBattery: Built-in 170mAh Rechargeable Battery(Included)Standby Time: about 12 HoursCharging Time: 2 HoursFeatures: Bone Conduction, Long Standby Time, EarhookSize Details: 6.7cm x 5.2cm x 1cm/2.64" x 2.05" x 0.39" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bone Conduction Bluetooth-compatible Earphone1 x Charging Cable1 x User Manual