GE 98751 GE High-Speed USB 2.0 4-Port Hub - Manual (Page 7)

Page 7
How do you know which power mode is right for you? Most applications
do not require an AC power adapter. If you have high powered devices
connected, your computer may display an error message indicating the
hub has insufficient power to support the connected devices. This will
indicate that an AC power adapter is necessary for your application. If
you are not sure or if device performance is poor, use the AC adapter.
An AC adapter can be purchased from our website for $9.99 plus
shipping and handling. For more information, please visit:
http://www.jascoproducts.com/hubpowersupply.html
When using the AC power adapter, make sure the plug is properly
connected to the hub and to a standard electrical outlet. GE Surge
protection is recommended.