Go Higher with the Promaster altichron, the newest addition to Citizen’s Promaster Collection. designed with professionals in mind, this watch is ready for the toughest of conditions and features an altimeter that can measure from -300 metres (under sea level) to 10,000 metres. additional features include an electronic analogue compass with rotating bezel and power reserve indicator. With eco-drive technology the watch is powered by light and never needs a battery. Features – altimeter range -300 Metres to 10,000 Metres, electronic Compass with rotating Bezel, Power reserve indicator, screw-Back Case, anti-reflective Crystal, Water resistant to 200 Metres, Case size: 46mm