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close connection with no gaps
It has a micro USB connector that may be used for data transfer as well as power input
The module has a PCB antenna seat ANT1
an on-chip 20 k ohm output pull-up resistor can be enabled
making it an excellent replacement for a normal soldering iron
4 Channel RF Wireless ON/OFF Smart Switch with RF Remote Control 005 2.1MM Back 3-Pins DC close connection with no gapsA Four channel relay board with a wireless RF interface that can be controlled by a wireless remote. The relays can regulate 250 V 10A appliances, motors, and other electrical circuits, etc. When the remote is in line of sight, the board has a range of 100 meters and roughly 25 meters indoors. This board's RF connection operates at a frequency of 433MHz. Both the transmitter and the receiver have an inbuilt antenna and are easy to use. Receiver
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