Specifications Features 9 LED candles that you can blow on, to make them flicker and go out, like you do with a real birthday cake! Each candle blinks with random period and phase that depends on the intensity of the air flow Piezo sensor and a special air trap to detect air flow with astounding sensitivity using resonance effect Atmel ATTiny44 microcontroller on board with 4 kilobytes of flash memory and 2 ...