Features: 1. UPC1237 has best performance as core devices, with power-on delay, DC protection and power anti-shock function. 2. Use OMRIN original high-current relay as the core of the device, not afraid of contact ignition and oxidation. 3. Using 7812 as a regulator, wide supply range, up to any range AC12V to AC24V. 4. Precision CNC double-sided circuit tin plate, small size, easy installation. 5. Start delay 1S closed, no need to use 3S delay. 6. DC monitoring and protection, real-time protection speaker. 7. This version can be controlled 500W amplifier, each channel using a relay control. Specifications: Color: Blue Material: PCB Size: 6.9 * 5.7 cm / 2.7 * 2.2in Weight: Approx. 71g Package List: 1 * DIY Kit Note: 1. This product is shipped as unwelded DIY spare parts. 2. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. 1、UPC1237 has best performance as core devices, with power-on delay, DC protection and power anti-shock function 2、Use OMRIN original high-current relay as the core of the device, not afraid of contact ignition and oxidation 3、Using 7812 as a regulator, wide supply range, up to any range AC12V to AC24V 4、Precision CNC double-sided circuit tin plate, small size, easy installation 5、Start delay 1S closed, no need to use 3S delay