A Sharper-Image, Sport Headphones Wireless, Designed to Stay in Your Ears with Comfort (Black). Latest and Greatest in Secure, plus Comfortable usage. Easy Pairing, can connect two Smartphones at the same time. Highest Quality Sound, Voice Prompt, Build-in Microphone, Music Volume Control, Noise Cancellation Technology. Bluetooth V4.0 + EDR, CSR 8635 Chipset, Standby Time: 240 hours, Working Time: about 4 hours. Operating Range up to 32 ft. (10 meters)