Brand Name: Techcool/OEM Model Number: BH1521 Style: Ear Hook Communication: Wireless Connectors: USB Use: Portable Media Player Function: Bluetooth, Microphone, Noise Cancelling, Waterproof Place of Origin: Guangdong, China (Mainland) Color: Black, Blue, Green, Pink, Yellow Bluetooth Version: V4.0 Frequency response: 20Hz-20,000Hz Standby time: 100 Hours Charging time: 2 Hours Net weight: 22g Chipset: CSR4.1 Battery: 3.7v/75mAH Receive distance: 10m /360 Working time: up to 4 hours Certificate: CE RoHs FCC Features: Stylish ear-hook design, avoid falling out. Bluetooth v4.0+EDR, support stereo music Built-in rechargeable battery Noise cancellation design, perfect sound quality Built-in microphone, answer/reject phone calls conveniently Compatible with most Bluetooth enabled cell phone/Tablet/PC/Laptop Support systems: Windows/IOS/Android Hands free while driving/walking Come with retail package, nice gift for yourself and friends