The lower blade guard can get stuck in the fully retracted position and not automatically release to cover the blade. The exposed blade poses a laceration hazard and risk of injury.
A wiring problem can cause the aquarium heaters to overheat or break during normal use, damaging the aquarium and posing fire and laceration hazards to consumers. Overheating can cause the heater to shatter or the aquarium glass to break.
The voltage detectors can give a false "no voltage" reading when being used to test live wires for electric current, posing shock, electrocution and burn hazards to consumers.
