Product Review

The Alteng noise cancelling headphones are engineered to sound better, be more comfortable and easier to take with you. Put them on, suddenly everything changes. Your music is deep, powerful and balanced, so quiet that every note sounds clearer. Even air travel becomes enjoyable, as engine roar gently fades away. No matter how noisy the world is, it's just you and your music-or simply peace and quiet.

Active Noise Cancelling Technology:
Build in ANC circuitry continuously measures, compares and reacts to outside noise-then cancels it with the opposite signal to make quiet sound quieter and music sound better.

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 :
Built in rechargeable 3.7V Lithium battery, easy to recharge it with the included micro USB cable without replacement. Note: it's wired, no Bluetooth compatible.

Specifications:
Category: Active noise canceling headphones.
Input Terminals:DCΦ3.5DC Plug 4
Working Voltage: 3.7V
Noise Level: 18db-20db
Signal to noice ratio（SNR):≥90db
Power Supply: 120mAh lithium battery
Operating Time:ï¹¥ 20h
Speaker Diameter: 40mm
Speaker Frequency Response: 20Hz - 20KHz
Speaker Sensitivity: 115dB
Headphone Cable Length: 1.2M
Product Size: 7.9inch x 2.4inch x 6.3inch
Product Weight:0.4lb

Package Included:
1x Active noise cancelling headset
1x 3.5mm audio cable
1x Airplane joint
1x USB Charging cable
1x 1x Headset carrying case

Warranty:
Reliable and friendly customer service, 2 year warranty and lifetime support guarantee.