Compared with the two cameras mentioned by the building owner, I think Laicai HD-A260 should be a better choice, with a more comprehensive lens focus section and more stable[Detailed]
It is recommended that the building owner replace a video player to play the video first. If there is still no sound, you can check the relevant settings of the camera for video shooting[Detailed]
I don't know this brand. If the output voltage of the charger is 5V, you can try the following: 1. Get a 1000MA output charger, mobile phone/digital[Detailed]