Muze &reg; G18 In-ear Wireless Bluetooth 4.1 Headset Hands-free Sports Music Neckband Earphone Earbuds Supports CSR DSP with Mic and Voice Prompt for Smart Phones with Bluetooth Function (WHITE) Features: magnetic design, report incoming call, voice activates calls, smart noise cancelling Up to 6 hours of continuous talking / music time and up to 180 hours of standby with 3 hours full charge Effective distance is about 8Meters(Depend on the condition and straight-line distance between mobile Compatible They pair easily and fast with almost all Bluetooth enabled devices, allowing simultaneous connections with two different cell phones or tablets Easy-of-using: control volume, select songs and receive phone calls via the buttons on the interfaces