The D'San PRO-2000BT-KIT is a wireless version of the PRO-2000KIT. Includes Limitimer with internal Bluetooth transmitter, podium signal light (PSL-20V) and separate Bluetooth receiver (RFR-2000BT) with its own power supply.Use this kit to give wireless signal light communication to any existing Limitimer System that you own. Includes an external Bluetooth transmitter that is powered via the Cat5 connection to a timer and a receiver with its own power supply. DSan offers Bluetooth technology for wirelessly connecting the timer to signal lights. Range is about 200 feet. Generally, the transmitter is integrated into the timer and the receiver(s) are separately powered devices to which the signal lights are connected via Cat-5 cable.