This electric bolt lock is external mounting type,can be installed to the frame and door directly,do not need to dig holes when installing. Description of this M-212F External Mounting Electric Bolt Lock Instructior Manual for Hotel This electric bolt lock is external mounting type.can be installed to the frame and door directly.do not need to dig holes when installing. This lock can replace magnetic lock and is suitable to the narrow frame door whose frame and door leaf are at the same vertical There is fixing plate to make the installation is more conveniently The bolt has tamper-.resistant function and LED light indicates its status. There is door status sensorNOCOM and opening door contact The lock will he opened by making the orange cable and black cable short circuit. Auto relock jumper is adiustable 0/3/6/9s.