Internal dimensions in inches: 3.15" x 2.0" x 1.2" // Internal dimensions in centimeters: 8cm x 5cm x 3cm | Waterproof and weatherproof. Thoroughly tested in all environments: snow, rain, mud, etc. | Rust-proof Neodymium magnets. Built with the strongest Neodymium commercially available and can withstand over 50lbs of separation force. | Built with durable PC and ABS that does not interfere with incoming or outgoing signals. The color has been carefully selected to be discrete against vehicle chassis. | LIFETIME WARRANTY - We are a US-based company and stand behind all of our products. The quality of this product is guaranteed. If the product exhibits any defects in workmanship or materials, we will replace it free of charge.