Features: 1. Set Time: Long Press "Down" key into setting time. Click "Up","Down" to select time, and Long Press "Down" key to finish. 2. 12/24 hour module: Click "Up" key to change. 3. Sleep module. Long Press "UP", while no display, into sleep module (22:00~07:00 no display. 07:00~22:00 display). Display all "0"number, out of sleep module. 4. Set back color: Click "Down" to change color. when color refresh that means it is into change color automatic (every day change 1 color), or color is fixed. Specifications: Power: Micro-USB 5V 1A Material: Metal + PC Backup battery module: CR1220(not included) Package includes: 1 * Circuit board 1 * Acrylic Enclosure Box 1 * Screw kit Only the above package content, other products are not included. Note: Light shooting 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.