The Losi LOSA4240 Battery Strap & Droop Gauge is a versatile accessory that is compatible with a wide range of RC cars and trucks. It is designed to work with 1:6, 1:8, and 1:10 scale models, and is suitable for both gasoline and electric fuel types. The black strap and droop gauge combo is made in Taiwan and is suitable for ages 8 and up. It is a great addition to any RC enthusiast's collection, providing accurate readings and reliable performance.