1, the ABS shell filled epoxy resins and packaging chips coil through ultrasonic welding with various combinations of cards in the shape of a circle, an em, Temic, Atmel, Tk series chips. 2, transparent blue, transparent red, black. More than 4,000 have only three colours, can screen icon, Penma; Waterproof, dust-proof, anti-vibration; Adaptation Temperature-10~+50 degrees.