1. Realistic design: Made of ABS material environment-friendly waterproof smooth edge no harm to hands streamlined body shape bionic joint design tail can swim freely with its own like a real shark. 2. Large capacity battery: the remote control fish uses a 3.7V14500\500mAh rechargeable lithium battery full charge can play for half an hour equipped with two lithium batteries a screwdriver a USB battery charger. 3. 2.4GHz remote control frequency: exclusive control of 2.4GHz frequency can be operated by multiple players together without interference 30-40m remote control distance after Bluetooth pairing you can only swim in water. 4. Easy to use: use the left and right push rod to control the fish forward or back the upper right button has the function of speed control and is equipped with English and Chinese instruction manual.