Cressi's genuine Watchband replacement compatible with the Cressi Cartesio dive computers. The Watchband is easy to change, is fastened to the computer by two easily accessible screws. The Watchband is made from durable rubber with a corrosion-resistant metal buckle. The length of the 2 parts is 14 cm and 10.5 cm | 5.5 in and 4.1 in. The screws are not sold included with the wrist strap. They are available separately. Made of stainless steel and sold by pair. The Battery Kit is composed by a CR2450 3V battery and an o-ring. It is recommended to proceed 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. Cressi has been an Italian brand pioneer in scuba diving, snorkeling and swimming equipment since 1946.