This is the second generation of the Jolly Logic AltimeterOne for use in stuff that flies (model rockets, planes, quadcopters, helis, kites, gliders, falconry). Features a bitmapped, animated display. Tiny and rugged, the AltimeterOne uses a state-of-the-art pressure sensor to measure the peak altitude of flight for rockets, planes, falcons, quadcopters, and kites. No batteries required: the AltimeterOne plugs into a USB port to recharge. Its durable construction and convenient tether point make this the only altimeter that can be mounted just about anywhere, including small rockets and the legs of hunting falcons and hawks. Although data is NOT downloadable, the peak altitude is displayed on the sunlight-readable LCD screen and the last hundred flights can be viewed with the History feature. Certified for contest use by the National Association of Rocketry. Note: this is not an altimeter that you could use for activities like hiking. It's for flying things only. This device does not have a warranty beyond the initial opening. Flights can result in crashes, and the device can be damaged.