Dear customer, our company has always taken honest service as one of our purposes. For all the issues you have mentioned, we have been actively responding to your requests and giving you feedback. Even during our Chinese New Year holiday, we have been actively to respond to all your messages. We have been trying to invite you to solve the product problems you mentioned through video conferences, but you have been refusing our video requests and contacts. Several of our engineers have repeatedly tested and checked the product problems you mentioned and also demonstrated them to you. After using it, we did not find any product quality problems. There is no problem with the zoom function you insisted on. All functions of the product are normal. All of our product were inspected with professional equitments and make sure it was working then arrange the shipment . I'm sorry to bring you a bad experience, but we did not find any product quality problems.