Dual Mic and DSP: The Samsung WEP700 delivers crisp and clear communications by canceling out background noise with a DSP (digital signal processor). With its dual microphone to compare audio, plus noise and echo canceling technology, the WEP700 provides the ability to communicate in many noisy conditions. Lightweight In-Ear speaker is gently held in-place with Samsung's Detachable ear-hook, for use on either ear. Full featured: Call processing functions are easily handled via the multiple ergonomic buttons. Voice-dialing, last number redial, and all the standard functions are compatible. Bluetooth Hands-free profile(HF) and Headset profile(HSP) are supported on this Bluetooth version 2.0, class 2 device for fast, secure connectivity up to 30 feet away. Revolutionary noise reduction with voice separation technology Auto volume control (when calling) Detachable ear hook Dimensions : 46 (L) x 19 (W) x 11(H) mm Weight : 7.1g Talk Time : up to 6 hrs Standby Time : 130 hrs