This relay module is a general purpose SPDT relay with or without transistor drive. It has diode protection for back EMF and a LED to indicate power. Dimensions 38mm (L) x 28mm(D) x 17mm (H). Rated 1AMP @ 24VDC.
This PCB is simply an RJ45 socket brought out to eight screw terminals. Dimensions 59mm(L) x 22mm (D) x 18mm (H).
This product is a RF kit including miniature receiver and two 2CH fobs. The fobs are fixed code units matched to the receiver. The receiver is a super regenerative type (-103dBm) which draws 9mA in standby and has an on board SPDT relay rated at 3A @ 24VDC. The relay latches on when "A" is pressed and latches off when "B" is pressed. The receiver draws 25mA with the relay on. Frequency of operation is 433.92Mhz.
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