Relays can switch AC and DC, can switch many contacts at once and can be used as amplifiers for electrical energy. Specifications: 38 * 33 * 17mm, 40 * 30 * 17mm, 40 * 30 * 22mm, 66 * 43 * 25mm, 38 * 33 * 17mm, 40 * 30 * 17mm .  Can be customized shunt and connecting wire welding, welding leads to a different terminal