This solar powered watch recharges itself in any kind of lightThis solar watch does not require any battery replacement. -The watch has a calendar function: Date Solar Powered Stop Watch 24-hour Display Tachymeter High quality 21 cm length and 20 mm width Silver Stainless steel strap with a Fold over with push button clasp Case diameter: 41 mmcase thickness: 10 mm case colour: Silver and dial colour: Blue Water resistant: 10 bars -Weight: 140 g The watch is delivered in an original gift box and has a warranty of 2 years