Support 125KHZ ID card. Frequency: 125KHZ. 1pcs 125Khz RFID Proximity Sensor EM ID TK4100 Card Reader. Note: This is just a ID reader, can not write. Interface: USB. Weight: 100g. Plug and play, the standard computer USB keyboard interface mode, no need loading any driver, the computer system will automatically will its as human learn input device.
eBay