Timer Relay 1) 3 digit bright LED timer relay 2) Thumb switch setting 3) Power fail memory timer 4) Timing range: 0.1S- ... digital Timer RlayHM series Timer Relay has timing function with 3 digit LED display, and thumb swtich for setting timing value. Our HM4 ... including timing unit selection (hour, minute, second), output mode selection (3 modes), output maintain time setting, key lock function, etc.4 ...