Features: It is a learning code wireless remote control switch (receiver). It is easy to match the transmitter (remote control). Strong signal which can pass through walls, floors, and doors, allowing control of the receiver from any location within a reliable range. Compact size with stable and reliable performance, featuring high receive sensitivity. Suitable for a wide range of applications such as automatic doors, windows, lifting equipment, and access control systems. Ideal wireless relay remote control for computer mainframes. Specifications: Working Voltage: DC 4V–12V (compatible with DC 4V, 4.5V, 5V, 6V, 7.4V, 9V, 12V) Standby Current: 7–9mA Working Current: 70–130mA Relay Rating: 20A (14VDC, 12A; 120VAC, 7A) Maximum Load: 10A (recommended load under 7A) Learning Code: Equipped with a learning button to add transmitter Working Mode: Momentary or Toggle mode, selectable via jumper Compatibility: Designed for computer mainframes Size: Approx. 43 x 30 x 22mm / 1.69 x 1.18 x 0.87 inch Remote Size: Approx. 60 x 30 x 12mm / 2.36 x 1.18 x 0.47 inch Quantity: 1 piece Package Weight: 50g Package Included: 1 x Relay Remote Control Switch 1 x Transmitter (Other items shown in the image are not included) Operation Instructions: Momentary Mode: Press and hold to turn ON, release to turn OFF Toggle Mode: Press once to turn ON, press again to turn OFF GND – Ground input VCC – Power input positive NC – Normally Closed terminal COM – Common terminal NO – Normally Open terminal Clearing Code: Press and hold the receiver’s learning button for approximately 5 seconds until the LED turns from ON to OFF, indicating the code has been cleared. Learning Code (Momentary/Toggle Mode): Press the receiver’s learning button; the LED will flash slowly, indicating learning mode is activated. Press the transmitter button. The receiver LED will flash rapidly twice, then slowly, indicating successful code learning. Press the learning button again to turn off the LED, completing the process. Note: Please note that new and old versions of this product may be shipped randomly. Ensure you are comfortable with this before placing your order.