Features: 1. A great replacement for door open button or other switches of devices, widely used in elevating controller, automobile, household appliances, machine tools, alarm system and other automatic control area. 2. An automatic switch for automatic regulation, with self-lock function, allows safety protection and circuit conversion. 3. 433MHz frequency ensure sensitive and strong signal receiving and transmission. 4. High-quality plastic material and professional PCB circuit board, safe without noise and spark, anti-corrosion, moisture-proof and anti-vibration. 5. Equipped with a portable remote control for easy and remote operation. 6. The signal can pass through walls, floors, doors, and stably control the receiver anywhere within a reliable distance. The maximum range is up to 50m (without obstacles). 7. Light and compact size for perfect portability and adaptability, easy to use. Control Mode: 1). Self-Lock Mode: Press->On; Press again->Off (Need 1 channel switch and 1 remote control button.) Press one button for working/ ON. Press the same button again for stopping/ OFF. 2). Inter-Lock Mode: Press->On; Press other button->Off (Need 1 channel switch and 2 remote control buttons.) Press one button for working/ ON, press another button for stopping/ OFF. 3). Jog Mode: Press and hold->On; Release->Off (Need 1 channel switch and 1 remote control button.) Keep pressing one button for working/ ON. Remove your finger for stopping/ OFF. Specifications: 1) Receiver: Working Voltage: 12V . Loading Current: 10A Frequency: 433/ MHz Size: Approx. 35 x 32 x 19mm/ 1.4 x 1.3 x 0.7in 2) Transmitter Color: White Frequency: 433/ MHz Button: 1 Button Battery: 2 x 3 V CR2016 button batteries (NOT Included.) Size: Approx. 35 x 60 x 9mm/ 1.4 x 2.4 x 0.4in Package Size: Approx. 90 x 80 x 30mm / 3.5 x 3.1 x 1.2in Package Weight: 42g Package includes: 1 * Wireless Circuit Board Relay Receiver 1 * Remote Control Transmitter (NOT Includes Battery)