1, Outdoor Master Engine：CA5050Z-1+1 2, Power supply: DC12V/1000MA 3, Power consumption: 40MA/300MA 4, Tone distortion: ≤ 8% 5, Tone SNR: ≥50db 6, Load capacity: 300 doors 7, Installation mode: wall embedded or iron gate fixed System Composition Outdoor Master Engine：CA5050Z-H 1, Power supply: DC12V/1000MA 2, Power consumption: 40MA/300MA 3, Tone distortion: ≤ 8%Tone SNR: ≥50db 4, Load capacity:400 doors 5, Installation mode: wall embedded or iron gate fixed Indoor Extension： 1, Power supply: 2, Power consumption: 0MA/100MA 3, Bell: dingdong electron bell ≥70db 4, Tone distortion: ≤ 8% 5, tone SNR: ≥50db Floor Distributor： 1, Power supply: 2, Power consumption:0.1MA/1MA 3, Branches: one entry and one exit, four branchesAttenuation：0.01dBSNR: ≥50db Power Supply： 1, Input: AC220V 2, Output: DC18V 2A 3, Battery capacity: 7AH 4, Working temperature: －35°C＋55°CP. 5, 19 Intelligent Building Speaker Phone Wiring