Features: Panel mounted; Advanced pre-setting one week before; Digital electronic timer switch with daily and weekly programs; Repeat programs with 17 on/off setting and manual override; Lithium battery power reserve when electric supply cut off; Specifications: Model: THC 15 A; Voltage rating:24V DC; Error correction: 1s/24h (25); ON/OFF operation: 17 ON/OFF ; Power consumption: 2W; Display: LCD; Minimum interval: 1 minute; Power reserve: 60 days; Power Supply: Built-in 1.24V 40mAh rechargeable Lithium battery; Ambient temperature: -10~+40'C; Ambient humidity: 35-85%RH;