【EAR HOOK BLUETOOTH HEADPHONE】- Small and invisible, instead of bone conduction headphones, no need to vibrate ear bones, more comfortable. The bluetooth earphone is super lightweight, painless wearing for long time use, latest concept ergonomics design fully fit outside the auricle. We have a patent for the innovative design.

【EXTERNAL SPEAKER UNIT】- Loudspeaker is close to the ear but it is not inside the ear. It will help listens to the surroundings at the same time, let you keep safety for biking, running, driving and more portable for business, work.

【SINGLE EAR WEARING & QUICK BLUETOOTH PAIRING】- Either left or right ear can be wearing. If you wear glasses, it suitable for small or thin glasses frames. Note: the first time to connect device, long press the power button for more than 5 seconds, until the white and red lights flash alternately, then open the bluetooth of your cell phone to search X21 and pair..

【CLEAR CALL AND MUSIC PLAY】- X21 bluetooth headset adopts CVC6.0 + DSP audio processing dual noise reduction technology to improve the sound quality. Built-in high-performance lithium battery, 70mAh large capacity for 3-4 hours continuous music play and handsfree call, 1.5 hours fast charging. And have integrated keys, voice prompts, battery level display and other functions.

【1 YEAR WARRANTY】- If your bluetooth headphones was malfunctioned within one year, according to your order record, we will send you a new replacement headphones. Please feel free to contact us concerning this product or other problems.