Features 1. Touch screen sensitive, smooth writing, quick writing function, Windows system PPT full screen use (this function only supports Windows system PPT full screen projection touch writing annotation use), capacitive head touch screen, replaceable design, no damage to the screen, smooth writing, durable (infrared screen & capacitive screen universal). 2. Volume adjustment/ Click the side [+/-] key: volume adjustment, long press the side [+] key: music pause/play, long press the side [-] key: close the window 3. PPT full screen state, use a key to open hyperlinks (hyperlink function is limited to office version of PPT use): click to select hyperlink / double click to open hyperlink 4. Multi-window switch in turn long press the hyperlink function key to execute the window switching function. 5. Type-c charging port charging, fast mainstream fast charging jack, faster transmission speed, fully charged battery life of 90 days, built-in polymer lithium battery, long battery life to say goodbye to the trouble of changing batteries. 6. Magnetic absorption, the receiver will not lose, magnetic design, integrated storage design, no drive receiver. 7. Applicable to various scenarios: company meetings, lecture training, teachers teaching, medium and large conferences.