1. Bluetooth 4.1 Bone conduction headphone 2. Small and covert, more comfortable. is very light, painless wearing in long time use, latest concept ergonomics design fully fit outside the auricle. 3. Loudspeaker 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. 4. Be free to choose exchange your left and right ear wearing, with glasses do not affect the wear. Compatible iOS, Android, WP system, as long as the devices have Bluetooth, it can be used. 5. Using CVC6.0 + DSP audio processing dual noise reduction technology to improve the sound quality. Built-in high-performance lithium battery, 5-6 hours continuous play, 5-6hours continuous call, 1-1.5 hours fast charge.Specification: General Model B18 Bluetooth Version V4.1 Protocol HFP1.6, HSP1.2, AVRCP 1.6, A2DP1.3, D11.3 Frequency Range 2.4GHz Transmission Distance Up to 10m Battery Battery Capacity 90mAh Charging Time <=1.5 hours Talk Time up to 6 hours Music Time up to 6 hours Standby Time up to 160 hours Package Weight One Package Weight 0.08kgs / 0.18lb One Package Size 19cm * 9cm * 1.8cm / 7.48inch * 3.54inch * 0.71inch Qty per Carton 100 Carton Weight 8.60kgs / 18.96lb Carton Size 46cm * 40cm * 20cm / 18.11inch * 15.75inch * 7.87inch Loading Container 20GP: 724 cartons * 100 pcs = 72400 pcs40HQ: 1682 cartons * 100 pcs = 168200 pcs