We ordered a cooling fan unit for our Sony A7iv camera and chose the Puluz unit because it doesn't have internal battery and is made from Aluminium housing. However, when we received and tested it, we were pleasantly surprised that it have a Peltier cooling chip on it! Good or bad, we'll only know after we use it in the field. We suspect that condensation might happen a bit too frequently because of the cooling. Perhaps they might want to release a version that only activates the fan so that the current draw on our power pack or battery power bank will be lesser. Based on our tests, the unit with Peltier cooling draws 5v 1.80amp in low and 5v 2.30amps in high.
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