Generation 2: Aircraft tug for airplanes up to 21,000 lbs. with dual tires and tire diameter up to 21". Lazy Susan platform for improved safety and ease while maneuvering aircraft. Made from lightweight, high endurance materials. Approximate size: 40" x 37" x 5". Weight: 237 lbs. Powered by 4 ultra high torque electric AC brushless motors. Rechargable 25.6 volt LiFe PO4 battery with recommended charge time of 2 hours for continuous usage time of 30 minutes Intuitive radio remote control transmitter. FHSS (Frequency Hopping Spread Spectrum); 100% interference free from other 2.4 GHz systems. Track technology provides superior traction. Anodized aluminum finish provides long lasting protection. Maximum speed is 120 ft. per minute (Approx. 1 - 1.5 miles per hour). Acceptable wheel types include non-wheel fairing, nose wheel, single wheel and dual wheel. Recommended surface conditions: moderate terrain and moderate incline. Warranty: 1 year labor and parts.