Physical: Durable alloy case that resist drops, explosion and waterproof, stainless steel contactor. Additional Description Physical: Durable alloy case that resist drops, explosion and waterproof, stainless steel contactor. Memory: 128KRAM (4096 patrol records) Communications Port: USB 19200bps Storage temperature: -40to90 Operating Temperature; -40 to 80 Power: 3 V lithium battery