"The Explorer Surface Mount compasses combine size and accuracy with a push button system for easy-on mounting, easy-off storage and security. Specifications: Boat Style/Size Power/Up to 24 Feet (7.32m) Dial Size/Design 2 3/4” (6.99cm)/Direct Read Night Lighting 12V Green Compensators Built-in Warranty 5-Year Approx. Shipping Wt. 1 lb. (454g)"