4 Channel 4Ch RF Remote Controls Remote Transmitter and Receiver Switch Module Wireless self Learning 433mhz RF Extruder Kit Right Side Upgraded Red MK8 All Metal Bowden for 1.75mm Filament we highly recommend placing a

we highly recommend placing a [1N4007 Diode] in parallel with the coil (in reverse bias) to protect your circuit from voltage spikes during de-energization

Stable Mounting - Securely holds HC-SR04 sensor in fixed position

Four-channel relay module with 10A switching capacity per channel

allows field repairs

4 Channel 4Ch RF Remote Controls Remote Transmitter and Receiver Switch Module Wireless self Learning 433mhz RF Extruder Kit Right Side Upgraded Red MK8 All Metal Bowden for 1.75mm Filament we highly recommend placing a4 Channel 4Ch RF Remote Controls Remote Transmitter and Receiver Switch Module Wireless self Learning 433mhz RF