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VERSATILE 7-DAY DIGITAL TIMER: A general-purpose timer with 4 ON/OFF periods per day. Programme every day the same, weekdays and weekends separately (5+2), or each day individually. It's ideal for lighting, heaters, pumps, immersion heaters and other fixed appliances. VOLTAGE FREE CONTACTS FOR EXTRA FLEXIBILITY: Unlike standard timers, the NTT04 can switch separate circuits such as 24V lighting, as well as standard 230V mains loads. This makes it suitable for a much wider range of home and commercial applications. BOOST, ADVANCE & OVERRIDE: Press boost once for 1 hour or twice for 2 hours, and the output switches off automatically afterwards. The Advance/Override button lets you skip to the next programme or hold the output permanently ON or OFF. RELIABLE BATTERY BACKUP & AUTOMATIC CLOCK CHANGE: A built-in rechargeable battery with around 720 hours (approximately 30 days) of reserve keeps the clock and programmes safe during power cuts. Optional automatic summer/winter time changeover means no adjusting the clock twice a year. 16A RATED, PROFESSIONAL INSTALLATION RECOMMENDED: Switches 16A resistive loads (3.68kW), 2400W incandescent and halogen, 750W fluorescent and 100W LED or CFL lighting (up to 200W LED with the Timeguard ZV900, sold separately). The illuminated screen and red power and green output LEDs make it easy to check at a glance. It fits a 32mm single gang wall box. Installation by a qualified electrician is recommended. Not suitable for use with discharge lighting.