Enegg Wireless Bluetooth 4.1 CSR Stereo Noise Cancelling Earbud Earphone Earpiece Headset Headphones with Microphone & Hands free Calling for iPhone, Samsung, LG, Motorola, Android Cell Phones, Blue Easy to carry. more humanized design, Easy operations, simplify the steps easy to use. Voice control, Say "Yes" or "No", you can control call phone. Memory pairing, Echo cancellation. Same time Connect Multiple bluetooth devices. Bluetooth Version 4.1, CSR Chip 8635. Compatible all Bluetooth digital devices. CVC 6.0 Noise Reduction. Wireless Frequency: 2.4~2.8GHz High performance stereo Bluetooth earphone headphone. Battery supply: Built-in rechargeable lithium battery.