100% bone conduction headphones Lightweight, non-in-ear sports headphones with open ear hook Function: call function, support for music, support to switch songs, adjust the volume, call the voice assistant, answer and hang up the call, dual microphones Model Number: Bone Conduction Earphone M-1 Vocalism Principle: Bone Conduction Wireless Type: bluetooth Bluetooth Version: 5.0 Charging Method: CABLE Battery capacity: 150mAh Play time: 6-8 hours Charging time: less than 2 hours Style: Ear Hook Control Button: Yes Communication: True Wireless Volume Control: Yes Sensitivity: 88dB Impedance Range: up to 32 Earcups Type: Sealed Codecs: AAC Waterproof: Yes Frequency Response Range: 20 - 20000Hz Total Harmonic Distortion: 3% With Microphone: Yes Features: Apple Siri Support Headphone weight: 25g Is it true bone conduction: Yes Bone Conduction Headphone Instructions: 1. answer / hang up: tap 1 time Play / Pause: tap 1 time Reject: tap 2 times Previous song: tap 3 times Next song: play twice Voice assistant: contact for 3 seconds 2. on / off: long press for 2 seconds Volume up: short press 1 time Chinese and English switching: press twice quickly 3. volume reduction: short press once 4. headphone / microphone jack charging 5. detachable microphone colour:Black Material:plastic Package Contents: 1 x Bone Conduction Earphone 1 x USB Cable 1 x English Manual Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.