... and card, and sends the data to PDA, PC through Bluetooth wireless technology. It can detect UHF, 125 KHz, 134.2 KHz ... 20cm (write range is 70% of read range)Communication InterfaceWireless Bluetooth; Mini USBBluetooth Transmission Distance10-15mWorking voltageDC3.7-4.2V (built ... -40°C~+85°CAttachmentCharger,Data lines,SDKWe also can make bluetooth card reader to support 134.2K,125khz,13.56mhz cards ...