Each racer weighs approximately 230 grams and requires 3 x AAA and 3 x AA batteries (alkaline recommended). Each charge takes approximately 45 seconds and lasts for about 3 minutes. No assembly required – just charge and start racing.Please note: This product contains small parts and represents a choking hazard for children under 3 years of age. Adult supervision is recommended at all times when in use by a child. Product supplied may vary slightly from pictures shown.