IMPRES microphone conveniently clips to your shirt pocket or lapel and enables easy communication without having to remove the radio from your belt Features a noise-cancelling directional microphone that helps eliminate ambient noise and ease communications in high-noise environments Motorola's exclusive IMPRES technology improves voice intelligibility and amplifies loudness-even in noisy situations A large housing makes it easier to operate while wearing gloves in a more rugged environment Compatible with radio models XPR3300 XPR3300E, XPR3500, XPR3500E, XPR3550 and XPR3550E