Made of 316L stainless steel, this timepiece features a Naval watch case design. The round, skeletonized dial states "ANDROID MECHANICAL 17 JEWELS" at 6:00 and has blue/luminous hands. Its exhibition back gains intriguing visibility to the movement and rotor. The Rose-tone choice comes with a brown leather strap with tan stitches, while the Silver-tone and Gold-tone choices have black leather straps with black stitches. Mechanical Movement The artistry of watch-making finds representation best through the mechanical movement which requires painstaking skill and precision to create. A mechanical watch uses the regulated release of energy from a wound spring run through a collection of gears and an escapement to keep time. Mechanical watches must be manually wound via the crown in order to apply tension to the mainspring. Strap: leather. Movement: Seagull 9211 mechanical. Crystal: hardened mineral. Crown: push/pull. Clasp: Buckle. Strap measurements: 9-3/4 in. L x 24mm W. Case measurements: 48mm. Water resistance: 10atm - 100m - 330ft. Model numbers: Rose-tone: AD446BRS Silver-tone: AD446BS Gold-tone: AD446BG. Warranty: Two year limited warranty by Android. Additional features: This watch comes with Android watch box & Android warranty leaflet.