This high-capacity TRIAC thermostat combines unbeatable accuracy and silent operation. High-capacity electronic thermostat (up to 4000 W at 240 V). Timeless design complements any room. Ultimate temperature control the most accurate type of thermostat on the market (± 0.15 C/0.27 F). On-screen heating power indicator gives as-a-glance verification of power being used. 2-wire non-polarized connection means fast, hassle-free installation. Early Start function ensures programmed temperature is reached by the programmed time. Temporary bypass enables temperature override without changing programming. Battery-free backup means no-reprogramming your schedule after a power outage.