Glow in the dark This watch will glow in the dark after absorbed enough light energy. Since it is non-self-luminous, you must illuminate it with the bright light to activate the luminous function. Sealed and waterproof Precision waterproof performance, innovation and enhancement of anti-fog Suitable for everyday use. Splash/rain resistant. Not suitable for showering, bathing, swimming, snorkeling and water related work. High hardness coated glass mirror High hardness and wear-resistant mirror surface, no easy scratching,clear timing High-quality quartz movement provides precise timekeeping