3.1, ID, Fudan M1 single white card in a single material: The next single 1000 0.40 yuan, 0.39 yuan 10,000 orders in the material: Edition 25 10 000 0.35 yuan, 0.39 yuan version 10 10 000 one thousand packages printed ID, M1 card only 0.48 yuan (photos), but also as low as ten thousand, 043 yuan / Zhang, best quality, lowest price! Details into the factory site: http: //www.cardmei.com/ Name: ID thin card (standard card) Dimensions: 85.5 * 54 Packing: 200 box of chips: TK4100 Operating frequency: 125KHZ sensing distance: 2-6cm packaging materials : PVC, ABS packaging process: lamination, self-adhesive, ultrasonic package number: surface 18 ID card, ID itself, serial number, before 10 ABA code, after eight yards around the roots. Features: ID card thin double-sided printing, silk screen / offset printing LOGO, photos, graphics, and text. Typical applications: time and attendance systems, access control systems, identification, ID cards and other low-frequency tags card is the read-only non-contact IC card, it is powered by the reader induction and read only the card number stored in the EEPROM chip, the card number. write once before sealing card, the card can not be changed after the closure. Passive and avoid contact with the two most prominent features of the chip, radio frequency interface circuit is a critical core technology, which receives RF energy from the reader, the chip power and clock generation and load by phase and amplitude shift keying, etc. technology for wireless communication between the card and reader. Non-contact ID card is easy to operate, fast, reliable and outstanding advantages, access to a wide range of applications. A, ID cards for the main features of the carrier frequency 125KHZ ★ ★ card reader to transfer data to load amplitude modulation; ★ card data encoded using anti-jamming ability of the BPSK phase shift keying mode; ★ card to the reader Data transfer rate is 3.9kbps ★ total data storage capacity of 64, including manufacturers, distributors and user code; ★ card number can not be changed before and after the card to write letters, make absolutely sure that only the card number and security; two, ID card system works by the card reader and the background controller. Works as follows: (1) reader carrier signal will be sent out via the antenna; (2) the card reader into the work area by the card in the inductor and capacitor resonant circuit consisting of receiving the transmitted carrier reader signal, the RF chip card interface module thereby generating a supply voltage signal, the reset signal and the system clock, so that the chip "active"; (3) chip control module reads the data in memory after the phase modulation code modulated carrier on, the card back to the reader antenna; cards (4) readers received echo signal demodulation, decoding to the background computer; (5) according to background computer card legitimacy, for different Applications make the appropriate treatment and control.