ISD1820 Looper, w/ Piezo Mic, and built in speaker

nephews were over, so I made a couple toys to annoy my sister with :) they have just one 1820 chip with an 8 ohm speaker running off a 9v with a lm7805 regulator. includes a headphone jack, and volume knob. good runtime so far on one battery, 10 hours at least (and they get left on in empty rooms), and the 4 year old (youngest) loves it, lots of looped fart noises.