Fig. 1: Spa and hot tub keypad LCD display

Liquid Crystal Display (LCD) keypads for spas and hot tubs

Type of visual display in which a layer of liquid crystal is sandwiched between two transparent panels of polarized glass.  In most cases, this appears as black numbers or letters in a grey background and provides a lesser amount of visual contrast. (Fig.1)

Fig. 2: Spa and hot tub keypad LED display

Light Emitting Diode (LED) keypads for spas and hot tubs

Type of visual display in which semiconductor diodes glow when voltage is applied. LED’s can be found in all types of appliances from your tv remote, the tv display, alarm clocks, indicator lights, and much more. This type of display generally appears as red numbers or letters in a black background and offers a higher degree of contrast. (Fig.2)

Fig. 3: Spa and hot tub keypad with no display

No display keypads for spas and hot tubs

Some keypads will not have a display at all. These might include older Pneumatic Keypads, and Auxiliary Keypads. (Fig.3)