I: The RF card lock adopt the USA Atmel company's T5557 touchless RF card as the card key (TEMIC). RF card lock can use for hotel, apartment and office. Can make more than 100 piece card key for one lock II: Strengthen mortise latch, with function of anti-break and deadbolt inside. III: Panel use the high quality stainless steel, brass or Zinc Alloy. Handle use the Zinc Alloy or Casting brass, it is durable. Finish with gold or other expensive metal, to keep the lock always new and anti-scratch. IV: Power by 4 AA batteries, the circuit has the auto-startup circuit function, energy saving; Under voltage indication function, the CUP working voltage lower 4.5 V, the lock will indicate the under voltage, and the door can still open 200 times. V: Open time: After open, the lock will lock automatically. After the card insert, it will lock automatically within 7 seconds if do not open the door. Emergency open: Without any limits, even deadbolt function, it can open also. VI: Interface function: Supply the DLL, can connect with PMS, to tealize the hotel inform resource sharing VII: Software: Compatible with Window series, improved function and easy operation. VIII: Difference finishes available.