The Synergy Watch uses no battery to function. It uses the simple movement of your wrist to run this time piece. This quality watch is an Automatic Self Winding watch. Made with quality parts such as stainless steel casing , hand crafted wooden band and a natural wood edge. This stylish mens watch is perfect for any occasion. Wear Synergy on your next exploration trip. Every item you purchase from FR33EARTH helps a village start a farm to get our of poverty. Please Note: Due to the variable nature of wood, the color of your watch may beslightly different from the photo. Making your watch one-of-a-kind. Every watch is individually hand crafted by our artistic watch makers. We use 100% natural wood as a material, there may be some spots on the wood, This is not a quality problem. Item Type: Mechanical Wristwatches Clasp Type: Buckle Band Width: 24mm Case Shape: Round Style: Fashion & Casual Movement: Automatic Self-Wind Dial Diameter: 48mm Case Thickness: 14mm Boxes & Cases Material: Wood Band Length: 24cm Dial Window Material Type: Hardlex Case Material: Stainless Steel Water Resistance Depth: No waterproof Band Material Type:Leather Feature: None Gender: Men