Reventador volcano
Mario Ruiz (left) and Omar Marcillo checking out one of their monitoring stations near the hotelito. The box in front of Mario contains the data logger, some cabling, and a microphone (enclosed in the plastic bottle seen on top of the box). The foam cooler to the right encloses the car battery used to power the station. The whole thing is usually covered up by a black plastic tarp to keep moisture out.