> A betavoltaic cell could likely produce enough power to drive the LCD if not the beeper Another product, perhaps - but not this one. While they're cagey abou

> A betavoltaic cell could likely produce enough power to drive the LCD if not the beeper Another product, perhaps - but not this one. While they're cagey about giving actual numbers - the rendering that Dave of EEVBlog found was of a 100 microwatt device, about the same size/volume as an AA battery. At 100 microwatts, that's apparently just enough to drive one segment of a watch LCD display[1]. [1] https://www.quora.com/How-much-power-is-consumed-by-one-segment-of-an-LCD-display-on-a-calculator-or-a-digital-watch https://www.quora.com/How-much-power-is-consumed-by-one-segm...