Your arm gets tired long before he does. Ten throws in you are already negotiating, and he is standing there with the ball at your feet, completely unbothered. This automatic rolling dog ball moves on its own and changes direction when it hits something, so the chase keeps going without you throwing anything. A chew-resistant EVA shell takes the bites. What is going on inside: Automatic rolling: it rolls on its own and adjusts direction when it meets an obstacle 10 mm thickened EVA shell: built to resist everyday biting and cushion impacts Quiet operation: the cushioning exterior softens impacts and cuts rolling noise Textured surface: raised textures and tire-inspired grooves to grip, carry and chew Up to 80 minutes per charge: with one-button control to start and stop the action USB-C rechargeable: no disposable batteries to replace The unpredictable movement encourages your dog to follow, paw and chase, tapping into their natural hunting instincts without constant throwing. The textured exterior gives him a surface to grip and carry between chases. Raised textures and tire-inspired grooves make it easy to hold and interesting to chew, and the textured design is intended to gently massage gums during play. The removable outer shell gives you access to the charging port and the power button. Twist it open to recharge, then close it securely before returning the ball to your dog. The trail drawn behind it is the point. It does not run in a straight line, so he has to keep working out where it is heading next instead of waiting at the end. Three things the panel pulls out: the 10 mm shell it is wrapped in, the raised texture across the whole surface, and up to 80 minutes of running from one charge. At 2.76 in (7 cm) across it is a small ball, which matters for a dog with a big mouth. The three finishes are shown here with the material and charging port listed underneath. Specifications Outer material: EVA Diameter: 2.76 in (7 cm) Weight: approximately 3.53 oz (100 g) Charging port: USB-C / Type-C Power supply: rechargeable battery Control: short press to turn on, press again to turn off Runtime: up to 80 minutes per charge, and actual runtime varies with use How to use it Twist open the outer shell and connect a USB-C cable to charge. The indicator stays red while charging and turns off when fully charged. Disconnect the cable, short-press the power button, and close the shell securely before placing the ball in a clear play area. The charging connection and controls follow the supplied product instructions. Safety note: Supervise play and choose a toy size your dog cannot swallow. Inspect regularly and discontinue use if the shell becomes damaged or internal components are exposed. Chew-resistant does not mean indestructible. This toy is not a substitute for regular dental care or daily walks. Charge it, clear a run of open floor, and press the button once. He will work out the rest on his own.