Hi Friend’s, This is Mahesh Kumar Singh from Barana Electronics. I will telling something about our product’s This is our product’s 12V with battery back-up model Power Supply, You can run 12V- 4 Camera + 4 Chanel DVR, 8 Camera + 8 Chanel DVR & 16 Camera + 16 Chanel DVR. You see here is two screw, open this & open the box. You just see here is two pin input lead for main power, output DC jack for DVR & one output wire for camera. Now I am connecting these, this is output wire for four camera, second is DVR point connecting here & now i am connecting main input lead. Here is a switch at present this switch is in off mode. After completing of installation please on this switch. It’s keep always on for battery charging & proper battery backup. You can use 12V-7Ah or 8Ah battery. It’s easily available in market, people are using this battery in computer UPS. Now see these two wire, one is black & other is red, connect these wire black to battery negative point & red to battery positive point & put this battery in the box. On the main AC switch, if battery is not fully charge you just see one indicator is there it’s glowing & it’s off when battery is fully charge. Now see the out site of box cover there are two indicator green & red, one for green Main AC & other red for battery backup mode. When power is off it’s shift on battery & when power come it’s automatically shift on main AC. We are not using relay in this power supply it’s on-line UPS type power supply. We are not using relay due to some time it’s not working properly. Here is 12V-4 Camera power supply you can run 4 Camera & 4 Chanel DVR, 8 Chanel power supply you can run 8 Camera & 8 Chanel DVR 16 Chanel power supply, you can run 16 Camera & use separate power supply for DVR. In the day mood 3 to 3.5 hour’s back-up & night mood 2 to 2.5 hour’s. you will get more backup if using 8Ah battery & less backup on 7Ah Battery. In this box we are manufacturing 5V, 9V, 12V & 24V power supply. 5V & 9V for attendance machine, back-up time is around 4 hour’s. 12V for door lock systems, Camera + DVR. 24V power supply for fire alarm systems. You just see when main is on green indicator is on, & when power is off red indicator is on battery backup mode & output power is always on. When main AC power is come battery is charging & its showing yellow indication & when battery is full charge it’s automatically off. Thanks for watching this video, for more details in future please comments, likes & subscribe this channel. For more details you can contact us mobile no. 9911607784, Thanks.