FEATURES: 1, mechanical, no need battery and power supply 2,keyless but by codes entry 3.mortice deadbolt and tubular lock case are compatible. 4.set up new codes within 10 seconds without removal of lock from door.(see picture dia6 to know how to set up new codes) 5,master key can be provided according to customers requirements. 6.backset available: 60--70mm. 7. suitable for door thickness around 35--55mm. TESTING: 1. The mechanism button part(every button) has been pass more than 150,000 times pressing testing. 2. The handle turning handle(inside spring) has been pass more than 200,000 cycles turning. Dia6:the steps of set up new codes:1,use spoon to attract out the hold cover. 2, insert the code change key. 3. turn 60 degrees 4, input the codes you want to set 5,turn back the code changing key.