Bosch RCR1 Remote Control/Receiver for GRL160DHV Laser Receiver-Detector with Built-In Remote Control - Radio-frequency remote control allows for operation of all functions Allows for One-Person Operation of a Laser System - Saves time and money No Direct Line of Sight Required - Obstructions are no problem for remote control 500-Feet RF Remote Range/500-feet Reception Range Matching LCD Displays on Front and Back of Unit - Allows viewing from either side.