The function and features of TM card Sauna lock.: 1. Single card or two cards for opening door can be set randomly. 2. Necessary power: 4 standard alkaline batteries, it will give an alarm when batteries power is less than 3.6 v. 3. Expired period of batteries: above 15 months. 4.Automatic bounce, not need handle. 5. Mechanical setting can be used under abnormal instance 6. Stable running with gear wheel combination. 7. The belt who is likely watchband, it is rainproof, against high temperature, Anticorrosion and convenient to take. 8. Method of opening lock: use TM card to opening door and pretend insert card incorrectly. 9. The range of suited temperature: -30C?80 C? We are well-experienced professional manufacturer of hotel card lock in China. As one of the best and most reliable manufacturer of hotel card lock and safes in China, Orbita is dedicated to provide electronic locking systems to the hospitality industry