The bike start with key and original BMW sound so your children can get the real riding feel. ThisElectric Bike contain rechargeable battery with ultimate power.Children can ride and park with great fun. Easy to drivejust withpaddle.If your childcontinually drive the bike you will get 2-3hour battery backup.The LED display looks more classic.LED head light will help you to drive at night. 3 Gear mode can help child for riding at lower to higher speed. 4 music button contain real horn and multiple music. Always wear your helmet and all safety equipment and observe safe riding rules.For assemble take help from youtube. You will find there available assemble video.