Motorola PMLN7158 1-Wire Surveillance Kit, Translucent Tube - SL300 Motorola PMLN7158 1-Wire Surveillance Kit, Translucent Tube - SL300 Surveillance accessories allow the user to receive and transmit messages discreetly. This comfortable single-wire surveillance kit is designed with an in-line microphone and push-to-talk for users who prefer fewer wires.