The Kovix 12mm Alarm Disc Lock is made from hardened stainless steel with weatherproof electronics and a 120dB alarm. It has a lithium long battery life, with an alarm function selection. It has an ultra-durable double locking carbide pin with a stainless steel body with a corrosion treatment that is ultra-resistant. It is 100% rustproof. The Triaxial anti-lift motion sensor is sensitive, but not too sensitive and comes with a key and cylinder.