Fortress Mobile SD621G / FM621G 4-channel SD-card mobile DVR for commercial vehicle and fleet surveillance. Units were working when removed from service and have not been independently bench-tested since removal. Each purchase includes ONE SD621G recorder and ONE corresponding power harness. No cameras, SD card, GPS antenna, Wi-Fi/cellular antennas or other accessories are included unless specifically pictured. Units may show normal cosmetic wear and serial-number variation from prior fleet installation/removal. Accepts all reasonable offers and merges shipping when able.