please email first. we are manufacturer with more than ten years experience in producing electronic locks such as IC card lock and RF Card lock(sensor lock). We have our own R&D department which gives us strong technical support. We make all the designs of our locks ourselves and have got the patent for these designs. Our lock also has obtained the European CE Quality Certificate.   Thanks to the attractive design, scientific developments, advanced technology and high quality of our locks, our products have been very popular in the world market. Our locks already have about 2000 users, including international famous hotel such as Shangri-la.