... security turnstile made of 1.5mm 304#stainless steel with alarm system *Functions and Features:* 1. Unique incomplete wheel transmission is adopted ... , little noise and no mechanical impact3. Self-checking-power-on function, if power on, turnstile will auto get to be held ... card reading passing and another free passing, etc.5. A. Full-auto type: If power off, arm will fall automatically while ...