Esonstyle Outdoor Wireless Bluetooth 4.0 Sport Headphone Ear-Hook Fashionable Design Stereo Headset Handsfree Calling Integrated with Echo Cancellation and Voice Guidance for iPhone Samsung HTC and Other Bluetooth Devices Bluietooth 4.0 with CSR8610 Chipset, for high-fidelity stereo music and clear speech This Stereo Bluetooth headset Support noise reduction,echo cancellation and buit-in mic Long battery life - Talk time 7-8hours; Music play time 7-8hours; Standby time up to 240hours; Charger time about 2hours Easy to use and to be paird, One bluetooth headset can connect with 2 mobile phoens in meantime. Suitable for all Bluetooth enabled device, Samsung, Motorola, Nokia, HTC, Sony mobile phones, iPhone, iPad, tablet pc