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Srhythm Wired Active Noise Cancelling Headphones with Microphone Works in either mode It works in two modes, noise reduction state or common headset state. When battery runs out, it still works on common state. Rechargeable battery The Built-in 3.7V 250mAh lithium battery supports up to 20 hours playing time. Easy to recharge it with the included micro USB cable. Specification Ear Pads: PU high quality material Driver Units: 40mm neodymium Sensitivity: 98dbÂ±3db Impedance: 32 ohms Noise Reduction: 20db Noise Reduction Range: 50-500HZ Battery: 3.7V,250mAh Charging Time:2 hours Playing Time(ANC):10 hours Audio cable lenght:1.5m What’s In The Box: 1 x Srhythm On-Ear Wired Headphones (Model:NC20 ) 1 x USB charging cable 1 x 3.5mm Audio cable 1 x Airplane adaptor 1 x String pouch 1 x User manual WHY CHOOSE US: -Srhythm is a leading noise cancelling technology expert. We design and develop our own noise cancelling module. -We are headphone manufacturer of 10 years -Free customer supports: Please donât hesitate to contact our kindly, first-class, high-technical and efficient support team if you have any issues about Srhythm product. Note: 1. The headset is with bulit-in lithium ion battery. please keep at least 4 hours full charge before first time of use(suggestion:Don’t use the car charger at first time). 2. When using headphone in airplane,please ues the 2-pins plane adapter