Check the listing for details. PDK Prodatakey RGBP Red Bluetooth Mobile Credential Proximity Reader 125KHz. Condition: New. Listed at 350.00 USD. PDK Prodatakey RGBP Red Bluetooth Mobile Credential Proximity Reader 125KHz, New Standard technologies include Proximity (125 kHz) and high-security (13.56 MHz), so customers can set their migration path to secure credentials and security ecosystems. OSDP Multi-Drop accommodates many readers by running one length of cable, eliminating the need to run wire for each reader. ProdataKey’s Red Readers are in a class of their own, with OSDP secure connectivity, high (13.56MHz) and low-frequency (125 kHz) communication, and mobile-ready options. Red Readers are now one of the most secure and versatile readers on the market today, handling every application, from your daily install to the most secure implementation.le-ready options. Red Readers are now one of the most secure and versatile readers on the market today, handling every application, from y