Securityman DIGILCDNDVR2 Wireless App Based iSecurity System (Black) Do-it-yourself (D.I.Y) easy to setup and use 2.4GHz digital wireless recording system Increased range of transmission up to 200 ft. between walls and up to 490 ft. in clear line of sight Records up to 7500 (30-sec) video clips (single channel live view) on a 32 GB SD card (not included) with time and date stamp Auto overwrite function when SD is full Upgradable by adding up to 2 more cameras (SM-816DTX and/or SM-821DT pan-tilt-zoom camera)