Staff Button drop card: Representative patrols identity information can be directly worn on the body. Alien button: patrol officers on behalf of identity information to carry. Location button blue black button: Size: 72.5mm * 38mm * 9.6mm mounting holes: 4mm Diameter Material: polycarbonate white button / white film: the plastic package memory chips, have waterproof and shockproof easy to install, durable, with luminous Tip stickers, and other functions. (Optional panel, nice) tubular button: Size: 7mm * 28mm concealed installation may be embedded in the wall. Luminous paste: paste in the address for button surface, easy to read at night patrol personnel data. Description: a waterproof and shockproof, fight to fight, but to avoid the magnetic field and acid corrosion environment, difficult to install on the metal wall, corrosive strong electromagnetic field around noisy environments. Installation can be attached to an object, but also in the wall in Shallow.