Amyove Cool Mens Womens Lava Samurai Iron Metal LED Faceless Bracelet Wristwatch Blue LED/Black Bracelet Width Of Watch: Approx 2.50cm,Length Of Watch: Approx 22.50cm Screen: Two rows LED lights for time display Settings: Time, Date, Seconds (Watch looks like a common metal bracelet at normal conditon, time will be displayed just like lava while LED is lighting) Function buttons (right-side): Top (hour and date display + select) Button (change mode) Battery: one CR2032 battery (included in watch)( 2.54cm =1.00inch)