Features: 1. Equip with CSR8635 chip, Bluetooth 4.1 version, it could build faster connection & transmit stable signal in high speed. 2. Ergonomic design, with earhook & soft earmuff, more comfortable for long time wearing, good choice for sport. 3. Sweatproof, no need to worry the earphone would slid down while doing sport, & it could protect it from damages caused by sweat. 4. Noise reduction technology, it could reduce the interference from the environment, provide you enjoyment of music. 5. Simultaneous connection, this earphone could be connected with two Bluetooth devices at the same time. 6. Intelligent voice prompt, it could indicate you the real-time state of the earphone, such as power on/off, low battery, etc. How to use: 1. Bluetooth connection: Long press the power until the blue & red light flash alternatively, open your Bluetooth device & search Q12" click it & complete the connection. 2. Simultaneous connection: After connect with the first device successfully, then turn off the the Bluetooth & the earphone. Then turn on the earphone & connect with the second device. Open the first Bluetooth device again, the earphone would connect with the first one automatically. 3. Language change: when the earphone is at pairing mode (blue light & red light flash) long press the volume+ & volume- at the same time. 4. Volume change: short press volume+ or volume -. 5. Song change: long press volume+ or volume-. Specifications: General Spec"