Was looking for a simple, easy to read clock for the workshop. This got the job done. It also has the functions of date and temperature, but these do not interest me. The unit has the option for permanent display of time, which i choose. The instructions said to insert the battery. It was already inserted ... and did not work. I put in a new one - also did not work. I powered it with the usb-c cable provided. The cable did not sit firmly in the slot, so if you move it, it goes out, since there is no functioning battery back up. And you have to reprogram it. I ended up hanging out on the wall and taping the cord to it. Suboptimal, but good enough for the workshop. The "mirror" function is silly and useless