Alarm: With alarm in one channel, you can set the alarming time by random. Temperature Alarm: When the ambient temperature is less than the minium setting temperature or higher than the maximum setting temperature, the module will alarm to remind you to turn on or turn off the air conditioning to keep your home with the moderate temperature. Clock keep going when power down: After tune the preset time, even if power is off, power after that, no need to re-set the time. Board size: length: 81mm width: 81mm Working voltage: 5V Color: Blue Material: Plastic Package Contents: 1 x LED Electronic Digital Clock module kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.