You can easily use spy cameras to supervise your employees.
Most of the spy cameras have a smartphone app that you can easily access when you are at any place.
A spy camera with smartphone app connectivity is compatible because you can access the live footage whenever you want.
Avoid buying spy camera without a rechargeable battery because it might be costly to buy batteries whenever you want to use it.
Resolution determines the coverage of the camera.
Compare the cost of different spy camera models by checking their price tags.