1. Power DC has 3V to 9V.
2. LDR light sensor measurement
3. There are three audio output, the sound of the melody.
4. A switch SW2 use music.
5. Adjust the light intensity.
6. A switch SW1 select RUN = turn the music continued, WAKE UP = Play a sound when there is light.
7. Power pole switch circuit is not a shock.
8. Dimension 4.22 cm X 4.93 cm (1.66" X 1.94").