Hardware:1. Infrared control angle optimization: U2 can control the angle of 120 °, U1 can control the angle of 60 °.2. Infrared distance optimization: U2 40 feet, U1 25 feet.3. Battery cover design optimization: U2 to solve some of the difficult to change the battery problem.4. Key feel optimization: U2 increases the size of the number keys to avoid accidentally pressing other keys when pressing.5. Ergonomic design upgraded, texture and durability upgraded, anti-scratch designSoftware (macro optimization)1. U2 macros can add commands from the database, U1 can only add the case operation of the remote control, and cannot call commands from the complete database.2. U2 macros can add commands from Bluetooth devices, U1 macros don’t contain Bluetooth commands.