Upgraded Version: Compared with the standard version, the upgraded version adds a super capacitor, which enables it to have a power storage function. It can continue to charge your device for 5-20 minutes without pedaling, and the charging stability is better. Specification: Product name: Pedal generator Material: all metal Model: Standard Version/Upgrade Version Generator: Disc type ironless generator Generator power: 50W or 100W Power output: dual USB output (5V/3A, 9V/2.5A, 12V/2A) and DC output 1-35V Weight: 3.125KG Note: 1.Don't step on the generator. The generator is not enough to bear the weight of the whole person. Please sit on a chair to operate it. The chair is as high as possible, which will save effort and comfort. 2.We also have a hand-cranked version, if you need it, please contact us.