There are no similar devices on the market, for good reasons. Keep reading.
For an AC input, a Schottky bridge uses another volt (a bridge effectively has two diodes in series at all times.). Even at 12V input, it steals 8% of your tiny power input. At 1.2V input, there goes 92% of your power.
You can build it for maybe $10, or $5 in large quantity. Half a watt (24 hrs, 7 days) is 4.38 kWh per year. If your totally free, heretofore untapped, power source is available 10% of the time, the circuit won't pay for itself for at least 82 years.
Since it only handles $0.06 per year worth of electricity, the recoup of investment is very slow.