The TX-I Plus Delkim Bite Alarm is vibration sensing with no moving parts Total adjustability to cover all conditions High volume & wide tone range Large easy to use controls Twin clear high visibility LED's in violet, red, white, blue, green & yellow Variable LED brightness & Nitelite mode The TX-I Plus Delkim Bite Alarm has FM digital radio transmission with anti-theft-alarm 1 year + battery life Stainless steel hardwear, hardcover as standard, all weather reliability