Audience signal lights may be powered directly from Limitimer or plugged into AC outlet when more than 200' away. They may be set to receive any or all Limitimer programs. All feature multiple in-out RJ45 or XLR jacks for a variety of interconnections. Model ASL4 - "Traffic Light." Circular array of LEDS visible for 200+ feet. Case: 23" W x 6.5" H x 3.5" deep Model ASL4ND3BT - Model AS4-ND3 with integrated Bluetooth receiver. Can be driven wirelessly by Limitimer PRO-2000BT. Note: Requires local power from included 12V transformer Model ASL2-ND3 - 2"-high solid LED digits with green-yellow-red warning lights. Case: 11" W x 4.5" H 1.5" x deep