Product attributes: AC means the products only work with AC current. Panel mounted. Advanced pre-setting one week before. Digital electronic timer switch with daily and weekly programs. Repeat programs with 16 on/off setting and manual override. NiH battery power reserve when electric supply cut off. Color: gray white Material: plastic Technical Data: Model: AHC30A Temp.range: -20C+50C Power Supply: AC 220V 30A Power consumption 4.5 VA (MAX) Display: LCD Switching contact: 1 changeover switch Programs:16 on/off each day or week Hysteresis 2 sec/day (25C) Mini interval: 1min Capacity: 16(8) 250V AC Black-out: 60 days Timer range: 1min~168hr Recharge battery: 1.2V 40Ma Average error: 1s/24h, 25C Weight: 0.15kg Package Contents: 1 x SWITCH Relay 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.