Sunvito RQ8 Wireless 4.0 Bluetooth Noise-Cancelling Headphones with Mic, Black/Rose Bluetooth chip:CSR8635,bluetooth version: V4.0,make sure clear sound and strong signal. Portable and light weight fashion design, very easy to store in your bag Ergonomic earbud design, comfortable to wear. Built-in high performance polymer 80mAh battery,support 5~7 hours talking/playing time, and about 150 hours standby time. CVC6.0 noise reduction,ensure you enjoying music and have a clear call in a noisy environment. Clear bass resonance, and superior sound isolation.