Check the listing for details. TEB7AS 7 WAY SMART CHIP UNIVERSAL INTERFACE BYPASS TOWING RELAY. Condition: New, Made in United Kingdom. Listed at 24.14 USD. PROMOTION - GET THEM WHILST THEY ARE AT THIS LOW PRICE... 12volt electronic 7 way bypass relay for vehicle towing equipment. This relay takes an infinitely tiny amount of a signal from the vehicle and boosts the output signal for the 12 volt road lights on your caravan, trailer or bike rack. The relay has an audible signal speaker to ensure that you are aware that the indicators are flashing on your caravan, trailer or lightboard when indicating. These relays are incredibly reliable and UK made. I use the relays on my towbar installations. We have full confidence in them. Sold and sent ASAP by Evri courier to ensure you are not waiting too long for your relay. We always aim to package and post the item same day as you purchase. Thank you