Specification:

Bluetooth Version: V4.0+EDR
Frequency: 2.40GHz-2.48GHz
Power: ≤ 4 dBm, class 2
Effective range: 10M
Sensitivity: -84dBm / 0.1% BER
talking speed: 3M bps (asynchronous)
433.0 Kbps (synchronous)
Frequency response: 20 Hz - 20 KHz
S/N rate: 70 dB
Distortion: 0.10%
Speaker size: 40mm 
support: A2DP 1.2, AVRCP 1.0, HSP, HSF 1.5
Voltage: 3.7VDC (built-in 400MAH rechargeable battery)
talking time: 10 hour
standby time: 250hour
charge time: 2-2.5 hour
current: 40 mA
turn off current: 2 ~ 10 µA
operate temperature: -4 ~ +131°F(-20 ~ +55°C)

Features:

-【Outstanding Sound Quality】 The closed-back design provides you an impressive sound quality and Hi-Fi stereo delivers amazing music and voice clarity. Enhance your phone call quality and the enjoyment of music listening experience.
-【Durable Headphone】 Up to 400 mah battery capacity with only 4 hours fast charge, allows 10 hours continuous song playing, 12 hours phone answering and 240 hours standby time. And the protection board provides overcharge protection and short circuit protection, ensure the safety of batteries to keep the battery life last longer.
-【Hi-Fi Sound, Stable Performance with Bluetooth 4.0】 Low power lossless transmission Bluetooth Version 4.0 chip, with 2.4mbits/s transmission speed. It supports 99% of the devices that out of the market. Such as: Phones, Tablets and other equipments that with Bluetooth function.
-【Foldable And 360 Degree Surround Sound Effect】 Foldable designed allows headphone to be carried easily. 80MHZ independent CPU intelligent operation, track switch become more comfortable. High fidelity without distortion, it restores the real sound quality and music transparent.
-【Ergonomic design and Noise Cancelling】 Ergonomic design is the protection of auricle from compression.It provide passive noise reduction, largely ensures your using experience.
-【Several sound scene for options】EQ button support 5 sound scene,delivery different music enjoyment
-【Multi-founctional headphone】Bluetooth V4.0+TF card playing+FM radio+wired playing