... 1) Dy Model 888F: 2-way LED transmitters + super long distance car alarm system Main features: 1) Dynamic colorful LED transmitter ... to 1,000 meters 4) FSK technology, high stability and long distance 5) Sound, vibration, flashing LED indicate the vehicle status ... easy-to-understand icons 4) FSK technology, high stability and long distance 5) Sound, vibration, flashing icons indicate the vehicle status ...