Hobbywing Multifunction LCD Program Box Pro G3! Serves as a program card and a battery voltage checker at the same time, this optional HW Multifunction LCD Program Box Pro G3 is the ultimate tuning tool and a must have addition to your hobbywing fleet of (ESC) electronic speed controllers! Features a Built-in large 2.8" LCD screen to display, set, and share ESC parameters, a built-in Bluetooth module for a clean wireless connection, and a user-friendly and easy-to-navigate menu, this program box is intended for drivers with Hobbywing ESCs as a do it all multifunctional device!