1. HD stereo noise reduction Use deep stereo noise reduction technology to improve music and call quality and reduce external noise 2. Upgrade plug Add a plastic disc to avoid the wire-controlled reaction when the device jack is in contact 3. More professinal sound system The professional sounding unit is reorganized , and the high , medium and low frequency are precisely connected , and the sound quality is better 4. Double insurance is not easy to fall off The double-insurance design of the ear flaps , with it , runs freely without worrying about falling offSpecification: Package Weight One Package Weight 0.05kgs / 0.12lb One Package Size 9cm * 6cm * 3cm / 3.54inch * 2.36inch * 1.18inch Qty per Carton 250 Carton Weight 14.00kgs / 30.86lb Carton Size 47cm * 32cm * 32cm / 18.5inch * 12.6inch * 12.6inch Loading Container 20GP: 554 cartons * 250 pcs = 138500 pcs40HQ: 1286 cartons * 250 pcs = 321500 pcs