There's a power button as well as actual volume + and - buttons located on three of the four feet, which is much more convenient than being on the bottom of the speaker! (lovemyfire.com)
The USB micro port is protected by a small tab on the bottom of the speaker, but Ultimate Ears assures that water won't get gain access to internal electronics, even if this little door is left ajar. (digitaltrends.com)
Along the bottom of the speaker's front is a metal strip that holds the MA770's four onboard buttons and an LED indicator for which connection is active. (engadget.com)