Makes a great repeating "plink" sound! Create a pleasant alarm signal It is somewhere between a dripping faucet and the electronic chime "dinger" in a new car! The EDF1 makes a pleasant but very attention getting repeating sound! "Plink, plink, plink, plink" just like the water faucet dripping into a bowl of water! Use it for anything that requires a "different" audio alarm signal, or simply to drive your friends nuts! Plus, you will learn how a simple transistor oscillator together with the eternal 555 timer IC can make such a sound!