Delkim TX-i versions feature new twin super bright clear LED's, for maximum visual indication in day or night, four LED modes, for varying ambient light conditions, patented Delkim nitelite mode, new output socket for optional Delkim nitelite, improved audible warnings, battery fail or low battery, stainless steel speaker, multifunction colour coded push buttons for volume and tone check, push button easy access range check, anti theft alarm and inbuilt transmission to remote receiver (Receiver available separately)This top of the range bite alarm is hard to fault.LED colours available are red, white,blue,yellow, green & purple.