If you're looking for a headset which can provide loud and clear sound look no further. This headset has some amazing features, including a noise canceling microphone that enhances sound quality and voice-dialing performance. It is also designed to eliminate wind noise interference. Switch on the amplifier in noisy conditions to boost speaker volume, beyond the level of your phone. Universal 2.5MM jack compatible with most phones. Wraps around your ear comfortably, for all day wear. Comes with 2 lithium batteries (3V). Size: App. 5 inches in length.