Features: 100% Brand new and high quality It is possible to keep a pulse signal relay to stay in, then give a pulse signal, and the relay will break off. Or through a button switch, press the relay ON, and press again,the relay is OFF. Output power:The relay output is a passive contact, which can be controlled DC or AC load within 5A Adopted of high quality electronic components, and precision process, ensure for the durability Specification: Type:Self Lock Switch module Product model: YYLOCK-1 Voltage: 5V/12 V/ 24V(Optional) Weight: Approx.18g/0.6oz Connection port Description: 1, DC+: input power cathode 2, DC-: input power negative electrode 3, IN: signal input terminal (Negative trigger) 4, NO: the relay often opens the interface, the relay suspends before pulling in, and then shortens the connection with the COM. 5, COM: common interface of relay 6, NC: the relay is normally closed, the relay is short to the COM before it is pulled in. Package list: 1 x Self Lock Switch Module .