Bluetrek blends innovative design with cutting edge technology for mobile lifestyles with they combined stereo headphones and a Bluetooth Headset into an all-in-one device. The 2-in-1 Mono and Stereo Duo Bluetooth Streaming Headset is unique because of its dual capability. The Duo Stereo can be worn over the ear for mono or stereo usage. Mono + HiFi Stereo with Surround Sound and SRS WOW Ambiance Settings. Additionally, the Bluetrek Duo Stereo Bluetooth Headset has Voice Alert that notifies you of: number redial, reject a call, call your favorite number, microphone mute, mute canceled, pairing mode, pairing successful, SRS profiles, low battery, connected and disconnected status. Can also be used as an Stereo Bluetooth Adapter for any Device with an Audio-In (such as a Home tuner or cars with auxiliary-in ports). Up to 6 hours talk time and 168 hours standby time. Compatible with Bluetooth v2.0 +EDR, v2.1 ready and 3.5mm phones and devices.