4 DPDT signal relay module. TAKAMISAWA RY12W-K high quality relays, switch contact material - gold overlay silver-palladium.
Darlington transistor circuits drive relay coil, LED indicator for each relay channel.
High quality screw terminal block.
FR-4 fiber glass PCB, dual copper layers.
Dimensions: L72.5mm x W80mm x H18.1mm

Operating Voltage / Current (VCC): 8.5 to 15.6VDC / 120mA(at 12VDC).
Control signal voltage (IN-X):
0V - 0.5Vdc (low level), relay not action.
2.5V - 24Vdc (high level), relay action.

Output (relay switch) contact rating for each switch:
For AC, 120VAC / 0.5Amp
For DC, 24 VDC / 1.0Amp

Datasheet: