RFID Inductive Guard Tour Patrol Reader System Beep/Vibrating Alert w/Software and 100pcs Checkpoint Silicon tank, metal body with rubber shell outside, super durable IP67 standard, Completely water proof and guard proof, Sabotage absorbent, resistant to electrical shock Non-contact reading of RFID tag,Reading distance less than 5 cm Super storage capacity 4Mb Flash, 60000 records,POGO pin connecting cable, high download speed Power off protection. Real time internal clock