The Viking Electronics RG-10A Ring Booster to 10 REN is a white desktop ringer with a voltage of 120V. It is compatible with various brands and is ideal for home telephones. This product, manufactured by Viking Components, has dimensions of 7.50 x 7.50 x 4.70 inches and weighs 2.40 pounds. Designed for ease of use and convenience, this ring booster amplifier enhances the functionality of your home telephone system.