555 Timer IC – 1 Speaker 8Ω, 0.5W – 1 Resistor 1K – 3 Variable Resistor 10K – 1 Electrolytic Capacitor 10μF – 1 Ceramic Capacitor 0.1μF – 1 Ceramic Capacitor 0.01μF – 1 Rocker switch Spring M3 8mm screws- 8 9 volt battery 9 volt battery connector