Why bone conduction headphone? As the headphones sit on your cheek bones, your ear canal is left open and sound waves bypass the eardrum. The result is a revolutionary way of listening to music which still allows you to hear ambient sounds around you, with no loss of sound quality and no blocking of your ear canals. And once you’ve heard the sound, you’ll never go back to in-ear headphone. Increase Situational Awareness: With your ears left open, this bone conduction enables you to immerse in the new playlist while hearing the external sounds in order to decrease the risk of the accidents. Besides, you can also take a call while still listening to your colleagues or friends. Comfortable Fit: Since it rests on your cheekbones, your ears and ear canals won’t be involved at all, saving you from all of that soreness and pain. Additionally, this type of headphones was designed to fit snugly against your face, meaning they’ll stay put when you are moving around. The wireless design also means that you don\'t need to deal with pesky wires. 128 GB SD Card Supported: It supports 128GB SD card(not included), which turns the headphone into a MP3 and helps free yourself from the shackles of the phone during exercise. Wireless 5.1 Technology: With its advanced wireless 5.1 connectivity, you can enjoy more freedom as it allows up to 49.2ft transmission distance. Provide you with faster and more stable connection, and high-fidelity sound. IPX5 Waterproof: No fear of sweat or dropping. Wear it at the fitness club. Enjoy the rhythm beat and feel your heartbeat. Brand: iNova Product Type: Wireless Bone Conduction Headphone Color: Black Material: ABS Pairing Name: G2 Wireless Version: V5.1 Frequency: 2.4GHz Microphone Sensitivity: -42dB Wireless Transmission Distance: 15m/49.2ft Battery: 3.7V 120mAh Lithium Battery Charging Time: About 1Hr Playtime: About 5-8Hrs Standby Time: 120Hrs Input: DC5V Waterproof Rate: IPX5 SD Card: 128Gb Supported (not included) Cable Length: 26cm/10.24in Headphone Size: 10x13x6cm/3.94x5.12x2.36in Head Circumference: 20cm/7.87in Headphone Weight: 19g/0.04lbs Package Size: 20*18*5cm/7.87*7.1*2in Package Weight: 70g/0.15lbs 1 x Bone Conduction Headphone 1 x Charging Cable 1 x User Manual