Features:1. Excellent sound quality, ergonomic design: ear-ear structure, leather earmuffs, memory foam filling, soft and comfortable2. Clear call, high-quality microphone: the extended microphone handle can be adjusted by 120 degrees; built-in microphone, clear call, accurate pickup3. Easy to operate, integrated wire control: wire control integrated volume adjustment and microphone mute switch, easy to use, durable4. Simple design and excellent workmanship: high-strength engineering plastic with leather earmuffs, matte black surface effect5. The product is reliable and durable: up to 2 meters of wire, reliable and durable; 3.5mm audio plug, good bending resistance and long service lifeProduct parameters:1. Material: Plastic3. Plug diameter: 3.5mm4. Sensitivity: 102dB5. Frequency response range: 20Hz-20KHz6. Product weight: 0.15kgRelease notes:Single hole:1. For mainstream single hole (CTIA international standard)2. For mainstream mobile phone brands3. Not For some single-hole notebooks (not for all ASUS notebook series, Hasee and some domestic brand laptops)Double hole:1. For all desktop notebook computers and dual-hole version equipmentSpecification: Package Weight One Package Weight 0.09kgs / 0.21lb One Package Size 12cm * 8cm * 12cm / 4.72inch * 3.15inch * 4.72inch Qty per Carton 318 Carton Weight 30.00kgs / 66.14lb Carton Size 50cm * 50cm * 60cm / 19.69inch * 19.69inch * 23.62inch Loading Container 20GP: 177 cartons * 318 pcs = 56286 pcs40HQ: 412 cartons * 318 pcs = 131016 pcs