Daughter purchase a radio controlled alarm clock from Lidl a couple of weeks back but although the clock and alarm function well, the advertised motion sensing alarm cancelling did not work.
She returned it to the shop and a manager opened another box, waited for sync (2 AA batteries supplied in clock), set alarm and tried to cancel without pressing the button but no success with that one either
Daughter brought this second clock to me at the weekend and I dismantled it and found the usual RF clock module with black blob chip but with a second small pcb with another blob and wires to battery, snooze switch, a copper foil strip on the case front and a couple of blue LEDs (which were supposed to come on for 3 seconds on pressing the button - another non-working function).
Examined surface mount component soldering under eyeglass and checked battery voltage. There were 3 wires to the four tags on the battery compartment. Tracing them revealed that the clock module worked off one cell only but the LED/snooze/motion sensor pcb used the full 3 volts - which was absent.
Opened battery container and probed both batteries - ok. Then noticed the second piece of thin transparent plastic that had to be pulled out from between the other cell positive and contact.
Assembly was the reverse....