Find out the weight before you buy. Could be very heavy!
I've found this truvo detector to be good (purchased it seperately a few months ago when I moved into a new place), obviously it's not infallible and should use with caution but it has saved my bacon finding wires run in walls, you get a solid tone when it detects metal and a beeping tone for a live wire
Read the instructions carefully. It is clearly not a professional device, but can prevent you from doing damage. I moved to a new rented unfurnished place and wanted to put a Ikea cabinet for bathroom storage. I only needed two drilled holes in the bathroom to fix it. Thanks to the stud detector I found I could not drill exactly at the height the cabinet had to be fixed. This probably saved me from drilling the (metal) plumbing and causing major damage in the flat. I know it would have not worked on non-metal plumbing, but still, I am glad I used it.
Buy Bosch Blue, Bosch Green for light stuff only.
I don’t find the Bosch metal / stud detector to be very good. Also my Bosch SDS drill died so not enamoured with Bosch domestic products. That said, my small battery drills and screwdrivers have been great and this looks a good deal if they work and continue working.