No charge. According to the query of Flash official website, Flash is an enterprise providing instant delivery service, providing offline training for employees and improving service quality and efficiency. Flash offline training is free, and the company bears the cost. Flash delivery is a brand of instant logistics service in the same city under Beijing Flash Technology Co., Ltd., focusing on * * * enjoying economy, providing users with 7×24 hours, average 1 minute response, 10 minute door-to-door service and 1 hour express delivery service in the same city.