Coghlans Wrist Compass. Liquid filled. Luminous dial. Waterproof and impact-resistant. Adjustable Velcro strap. Fits most leather watch straps too. Weighs only 5 gr. 7/8" in diameter. Specifications for Coghlans Wrist Compass: Manufacturer: Coghlans Additional Features: Wrist Compass Waterproof No Weight: 0.03 lb Length: 6 cm Width: 3 in Height: 1 in Package Contents: Coghlans Wrist Compass