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With. >> let's go over it, right? you talked about the frequency. you talked about the pure tone or the chirp. which one do you want to hear first? the tone or the chirp? >> okay. let's hear the pure tone. it's like a whistle. pulsed. [ chirping ] >> okay. >> now, what that is, is -- it's a burst of pure tone for .2 second, repeated each second. >> okay. >> in other words, within each second, one fifth of it or .2 second is the tone. that's at a single frequency. in this case 1,000 cycles. so we can hear it. in our real case, it's 37.5 thousand cycles. they above our hearing. that's what the d...

The government put up power cables on the highway, but not in my village. i lived in the dark until i learned about solar lamps. the two lights in his home are thanks to celco, a private company that provides renewable energy options to rural households at an affordable price. >> we always tell people we're in between an ngo and a corporate. we are socially driven. if tomorrow we were to chose -- you were to ask us to chose between lighting up 300 homes and doing an institutional installation, we would do the 300 homes. >> reporter: they connect customers with local banks who finance it for th...