Keystone's new development! We are integrating Backpack USB signature function 🚀 Soon, you can directly connect Keystone to your computer or mobile phone with USB, and then operate it in Backpack software, and Keystone will complete the signature. It is worth mentioning that this function supports Windows, Mac and other systems, whether you are at home, in the office, or on a business trip, you can conduct secure transactions anytime and anywhere.