DSan offers Bluetooth© technology for wirelessly connecting the timer to signal lights. Range is about 200feet. 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.Limitimer System PRO-2000BTIncludes Limitimer with internal Bluetooth transmitter, podium signal light (PSL-20V) and separate Bluetooth receiver (RFR-2000BT) with its own power supply (not shown).