Official battery replacement for the Cressi Newton and Drake dive computer.Thekit is composed by a CR2430 3V battery and the o-ring. It is recommended toproceed carefully on changing the battery and the o-ring. In case of trouble,it is suggested to contact an authorized service center to change the battery.The Cressi Authorized Dealers are listed in the official Cressi website.Cressiis an Italian brand pioneer in scuba diving, snorkeling and swimming equipmentsince 1946.