Compatible with Synology SA series: SA3600, SA3400 23 series: RS2423RP+, RS2423+ 22 series: RS822RP+, RS822+, DS3622xs+, DS2422+ 21 series: RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+ 20 series: RS820RP+, RS820+ 19 series: DS2419+, DS1819+ 18 series: RS2818RP+, RS2418RP+, RS2418+, DS3018xs, DS1618+ M.2 SSD adapter card with two slots for super-fast storage