Seven days and 24 hours digital timer with RANDOM and SUMMER TIME mode; Direct plug-in timer intends to control the electronic power to the appliance; With 8 keys timer function; Time setting includes HOUR MINUTE and WEEK; SUMMER TIME change-over; RANDOM function; 12 hours / 24 hours changeable. 1. Initial operation: 1.1 Press "MASTERCLEAR" key to finish all systems screening within 6 seconds; 1.2 Use a sharp object (eg. a pencil) to press "MASTERCLEAR" key to delete all information you have set before; 2. "Week" key for ON/OFF: press "TIMER" key to enter the setting status; 3. Clock function; 4. Summer time change-over; 5. Random function; 6. Manual operation: ON / AUTO / OFF