TOSHIBA ULN2803AFWG 8-Ch Darlington Sink Driver 470nf 63V Polyester Capacitor The module has a PCB

The module has a PCB antenna seat ANT1

If the receiver input is an open circuit

Pole Dual Positions(steps)  5 Action Type Momentary Shaft Type D-type Shaft Length x Breadth 7mm x 6mm Rotary Switch Dimensions(LxB) 32

User Manual

TOSHIBA ULN2803AFWG 8-Ch Darlington Sink Driver 470nf 63V Polyester Capacitor The module has a PCBULN2803AFWG is a bipolar digital integrated circuit with 8 Ch Darlington Sink Driver. It is a high voltage, high current Darlington driver made up of eight NPN Darlington pairs. For switching inductive loads, all units include integral clamp diodes. Relay, hammer, lamp, and display (LED) drivers are examples of Applications. Features Output current (single output) 500mA Max High sustaining voltage output 50V Min Output clamp diodes Input capabilities