1, Magnetic screw driver, can hold the screw so tight, you can drive them in without making pre-made holes on the surface. Recently tried to drill some screws in for IKEA furniture, they kept slipping on the surface. So, I had to knock some premade-holes on the surface. 5 holes per leg, 20 holes for 4 legs of a table. This magnetic screwdriver head will do away with that extra step.
2, tuya remote on-off switch for desktop PC. Can shut the PC off or on remotely so the kids can't play games while the parents are at work.
3, wireless and battery less door bell.