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It can be used to increase maximal load of controller transistor output line and for galvanic isolation between output line and load point.

SPECIFICATION
Number of relay outputs: 1 
Power supply: 10  ... 14 V DC
Current consumption: 20 mA (max) @ 12 V DC
Relay maximal load: 1 A (max), 30 V DC / 50 V AC (max)
Output: 1 x NO / NC
Operation temp: -10 °C ... 50 °C
Weight: 0.02 kg
Dimensions: 30  x 27  x 18 mm
Manufacturer / Brand: PULSAR

Number of relay outputs: 1Power supply: • 10 ... 16 V DC,Relay maximal load: 1 A (max) 30 V DC / 50 V AC (max)Output: 1 x NO/NCManufacturer / Brand: PULSARGuarantee: 2 years

The wattmeter allows you to check the electricity consumption and calculate the energy costs
of the connected device. It has a large LCD display and simple
configuration of the cost measurement setting.

The ESP32-ESP-WROOM-32 development kit is an ideal kit for learning how to program the ESP-WROOM-32 module and testing its capabilities. One board contains the above-mentioned communication module / micro-controller, a USB -> UART interface based on the CP2102 chip, buttons that facilitate switching the device to programming mode and a voltage converter thanks to which the whole thing is powered directly from the micro USB connector. In addition, all pins of the ESP-WROOM module are provided as goldpin connectors, so the module can be used with any breadboard without the need for soldering. The device allows you to use Wi-Fi (802.1 b/g/n), Bluetooth / Bluetooth LE protocols and, if necessary, your own protocols written by the user.

The ESP32-ESP-WROOM-32 development kit is an ideal kit for learning how to program the ESP-WROOM-32 module and testing its capabilities. One board contains the above-mentioned communication module / micro-controller, a USB -> UART interface based on the CP2102 chip, buttons that facilitate switching the device to programming mode and a voltage converter thanks to which the whole thing is powered directly from the micro USB connector. In addition, all pins of the ESP-WROOM module are provided as goldpin connectors, so the module can be used with any breadboard without the need for soldering. The device allows you to use Wi-Fi (802.1 b/g/n), Bluetooth / Bluetooth LE protocols and, if necessary, your own protocols written by the user.