About this item Automation Security Relay The wireless light switch adopts RF technology, learning code of 433mhz wireless remote module has high-level security for its low repetitive rate and re-learn mode, by which it can delete the old code and re-learn a new code when a remote control get lost, so you are always in control of it. High Sensitivity & Resist Interference The receiving module provides high signal sensitivity and super resistant interference for excellent Long remote control distance and stable signal. Adopts non-directional wireless encoding technology, allowing independent control without mutual interference. Mini and Flexible Switch Relay Size: 2.95*2.12*1.10 inch. The volume is small and the signal can pass through walls, floors and doors. It is a perfect remote switch for those hobbyists with home automation DIY projects or business Industrial electrical. Easy to Set Multiple Mode this wireless remote switch has 2 modes of operation which is momentary / toggle mode, and the programmable RF receiver and transmitter can be flexibly configured in terms of quantity and working modes, which can satisfy almost any usage requirements. Widely Application This RF remote relay is widely used in industrial control and security fields, such as short or long range turn devices on / off, light, motor, remote