K4 – KRYPTO Bluetooth Mullion Keypad & Reader - CDVI’s KRYPTO K4 card reader facilitates high security! This KRYPTO Bluetooth mullion keypad & reader is compatible with the ATRIUM BT mobile application and the KRYPTO Mobile-PASS. The K4 works with the secure protocol of CDVI, the encryption keys guarantee end-to-end encryption between the credential, the reader and the A22K door controller. Main Features Get protected against unauthorized access, while also reducing fraud and identity theft with this card reader/keypad access device By using proximity technology this card reader/keypad access device provides robust and affordable security 4 to 8 digit code Compatible with ATRIUM A22K controller, ATRIUM BT App and the Krypto Mobile-PASS FULLY secure RS-485 connection Reads KRYPTO Mobile-PASS, 13.56 MHz Mifare Classic and DESFire EV1/EV2 credentials OSDP-2 compatible NFC & Bluetooth Up to 2” (5 cm) read range Power requirements: 12 VDC