invisible hidden lock for openable doors, invisible lock for wooden cabinets and drawers invisible lock with rfid card and key tags its unvisible from front side its not work on metal doors special lock for hiiden invisible application Application to: - hinged doors / cabinets - drawers - sliding doors Technology: - 125 kHz (EM4102 / EM4200) - Internal access control with key tags Features: - Battery or transformer operation - Approx . 20, 000 openings per battery - Door-open alarm can be activated - GYM version for a free choice of cabinets at fitness clubs or indoor pools - Programmable without PC - Easy installation & robust accessories: - Glass mounting kits - Mounting kit for metal cabinets - External antenna - Relay for controlling external units - Metal housing for applications over 200 kg tensile force - Master / slave locks for group switching - 3 V OPEN / CLOSE, 6-12 V OPEN / CLOSE Please note: - Please do not use any additional "push to open", "tip-on" or other spring mechanisms. - Temperature range 5-35 ° C. - Do not store with inserted batteries. - RFID does not work through metal doors - please use the metal kit or the external antenna.