Usage Tips:Mechanical Time Switches Manual /Auto Control SUL181h AC220V 16A Presetting Circle Time With 24Hours Mechanical Timer is suit for Water Heater, Water dispenser, Street lamp, Staircase lamp, Advertising lamp box, Breed , Irrigation, office power auto control, anywhere need time control in civilian, home or industrial, etc. It can set 48 programs to control ON or OFF of electric appliance in 24 hours. It can be programmed to avoid the of power, and distribute power in time limit to save energy. This timer is a kind of module for DIN guide rail, easy to installation in illumination box, and its so compact size with pretty form. Its time base component is adopt synch pulse motor and it is strong anti-jamming, small consume with performance stability. By manual or auto control Working voltage: 230V 45~60Hz Output: 250V 16A Built-in 500mAh lithium battery Reserve: 150h Setting times: 48 times Switch time unit: 30 minutes The shortest switch time: 30 minutes Dimensions: 11.0 cm * 5.3 cm * 6.8 cm colour: White + blue Material: ABS+ electronic components Package Contents: 1 * Timer 1 * English user manual Only the above package content, other products are not included. Note: Light 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.