Surveillance accessories allow the radio user to receive messages with the earpiece. The 3-wire surveillance kits offer flexible and very discreet communications 1 wire is for receiving, 1 wire for the microphone and 1 wire for the PTT. The PMLN5111 is a black 3-wire surveillance kit with translucent tubes and IMPRES audio. Motorola’s state-of-the-art IMPRES technology allows communication between the radio and the audio accessory. The result is optimal audio performance, enhanced audio gain capability, and increased customization, assuring the highest quality communication.