ITEM NAME:20pcs 5V Relay SIP-1A05 Reed Switch Relay 4PIN for PAN CHANG Relay lj Product Name Dry Reed Relay Model SIP-1A05 Voltage DC 5V Current 1A DC resistance 450~550ohm Contact Open style Body Size 1.9 x 0.7 x 0.5cm/0.75" x 0.28" x 0.2"(L*W*T) Pin Number 4 package:20Pcs.DC resistance 450~550ohm. Body Size 1.9 x 0.7 x 0.5cm/0.75" x 0.28" x 0.2"(L W T).