Description: ABS shell by the packaged chip coil and filled epoxy resin, through the combination of ultrasonic welding, and all kinds of special-shaped cards with the option of EM, MF, Temic, ATMEL, ST, TK series chips. Color choices: blue, gray, purple, red (4,000 or more do not choose color) Features: ① to silk screen icon, marking ② waterproof, dustproof, anti-vibration ③ adapt to temperature: -10 ~ +50 ℃