Material Blend Country of Origin Thailand Tough solar power Shock resistant Auto light feature will not work if the battery level falls below Medium (marked as M on the face of the watch) This model possesses tough solar and multi-band 6 Atomic timekeeping technology housed within an even slim profile octagonal case. Non-stop tough solar power provides energy via a small solar panel combined with a large-capacity rechargeable Battery that enables a variety of energy-hungry functions to operate smoothly. Black resin Band digital watch with neutral face. auto light feature will not work if the battery level falls below medium (marked as m on the face of the watch). turn on or off the auto light function by holding down the light button and turn wrist at a 40 degree angle towards the user in a dark environment