System power supply
Power supply: municipal electricity 220V
Input: AC220V/50HZ
Output: DC18V 2A (U2 with 12V, 300MA output)
Battery capacity: 4AH (U3 no battery)
Working temperature: -35 C ~ +75 C
Device size: 240*160*75 (U1, U2), 160*120*75 (U3)
Installation way: Wall preburied or wall hanging
U1 and U2 support UPS power supply