Ordinary Patrol button: stainless steel housing, the design life of 15 years, has a unique ID code, compatibility, waterproof seal. Information Bolts: also known as anti-theft bolts, can be embedded in the wall concealed installation, anti-sabotage stronger, more robust, more durable security. Luxury information button: Luxury stainless steel package memory chips information button, built-in can not be modified globally unique ID code, in-line communications. Shockproof waterproof, durable, and other functions, up to 20 years of life. General information button Installation instructions: Dimensions: 16.3 × 5.6mm Weight: 1.6g Shell: 304 # stainless steel reading speed: <5MS Storage Temperature: -40 - + 90 ℃