*Updated 2021* The TSW-MV is ideal for conformance to energy codes where you need assurance that lights are turned off when not in use and an occupancy sensor is not the best application. Perfect for store rooms, hall closets, broom closets & storage rooms. The TSW-MV is a solid state interval timer which easily replaces a wall switch to provide control of lighting, HVAC and other loads.Tamper resistant time-on interval can be presetPercent time remaining bar graph displayed in addition to count-down timeFlicker of lights and/or beep warning begins 2 minutes before count-down time elapses (Can be disabled by DIP Switch)Zero-Crossing Technology prolongs relay life by switching high-inrush equipment at close to zero powerCompatible with electronic ballasts, incandescent lighting, or motor loadsNo minimum load requiredEasy installation; fits standard 2 1/2” Wall BoxEasily replaces wall switch in existing installation