Description: Brand: KOTION EACH Model: B3505 Type: Headset Impedance: 32ohm Input DC: 5V\/130mA Plug Type: 3.5mm stereo Operation Distance: 10m Speaker Diameter: 50mm S.P.L: 106dB S.P.L. at 1KHz Bluetooth Version: V4.1+EDR Frequency Response: 20HZ-20，000HZ Audio Cable Length: Approx. 120cm \/ 3.94ft Connect Method: Bluetooth \/ 3.5mm audio line connect Battery: Built-in rechargeable 3.7V\/ 250mAh lithium-ion battery (Successive time about 8 hours，Standby time 180 hours) Features: 1. Built-in NFC chip in the right earcup of headset， support pairing through NFC function. 2. Good quality and fashionable appearance; adjustable length hinges and very comfortable to wear. 3. Supplied with a 3.5mm cable that you can use to connect the headphone to devices without Bluetooth. 4. High precision 50mm magnetic neodymium driver， bring you vivid sound field， sound clarity， sound shock feeling. 5. Earmuffs used with skin-friendly leather material， and super soft Over-ear pads that is more comfortable for long time wear. 6. Wireless Bluetooth headset， compatible with Bluetooth enabled devices， such as for iPhone， iPad， HTC， Lenovo， Samsung， Tablet PC， etc. Package included: 1 x B3505 Headset 1 x USB Charging cable 1 x English user manual 1 x Jack-jack 3.5mm audio cable