Poundland remote control light set. (with schematics)

This is one of Poundland's £5 range, and it actually represents very good value for £5. It's a set of three puck lights with a twist-off battery cover that also doubles as a wall or ceiling mount.
The set comes with an infrared remote control unit with mountable holster and offers four simple functions. Off, dim, on and 30 minute timer.
You can also manually activate the lights by pressing the front to turn them on and off.
Quiescent (standby) current of the receivers is about 250uA (quarter of a milliamp) and I got an erroneous reading of the transmitters standby current. It's much lower then I measured. I'll guess that the high resistance of the meter's microamp range possibly caused circuit instability resulting in continuous processor rebooting.
The units are actually very good.

When I mentioned the internal pull-up resistor function in the microcontroller I meant to say that the current is very low, so it's actually a high value resistance inside.

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