The Momentum M1 Twist is an oversized ladies' dive watch that is both fashionable and functional. With a variety of fun colors, it's a watch you can wear in and out of the water. High-grade, solid 316L stainless steel. Quartz analog (battery powered dial and hands). Heat-tempered, anti-glare crystal is virtually scratch-proof. Luminous, legible face for underwater and dim light conditions. The M1 Twist Watch is engineered for diving or regular use in or under water, with special screw-lock crown. Tested to 200M/660FT.