I've tried this product on several touchscreen devices (iPad, smartphones, laptops) and it doesn't draw solid lines on any of them. I have returned the item. I then received the email below. "We wholeheartedly appreciate your opinion and we are very sorry that the products did not meet your requirements and caused you any inconvenience. However, please understand that negative feedback is indeed very harmful to small businesses. How we are. Because it affects not only the product to which it corresponds, but also other products sold in the store. And I also hope for your understanding that we want to sell products that everyone can afford, and not individual products that only belong to the rich, and therefore will inevitably have different usage settings, of course we don't say your evaluation is wrong, but in fact, it can negatively affect people's judgment, which will be fatal to our sales. If you don't mind deleting your review, we'll happily refund your $30 in exchange for your understanding and apology. Of course you don't have to send the product back. Look for testimonials from our valued customers like you. Your help will be very important to us. Please give us a chance to do better next time. After you have deleted a review, please provide us with your PayPal email address. We will refund your PayPal account within 2-3 business days after it is deleted. If you prefer an Amazon gift card, we can buy one for you and send you a secret code. You can transfer it to your Amazon account and use it freely to buy any Amazon products. Thank you for taking your precious time to read this. Please don't hesitate to ask if you have any questions about this. Greetings and looking forward to your reply. "
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