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iFrogz’s Boost NearFIeld Audio speaker (model IFZ-BOOST) is a compact, portable audio amplification unit they works with any devices with built-in speaker, including mobile phone and portable media players. No set-up is needed, and ther’s no need for wires, Bluetooth or configurations. Simply place your smartphone or oter devices with music playing on top of the Boost. It will then use NearFA technology to syncs the audio signals and amplify the sound through 2W x 2RMS speakers.
The Boost looks just like a black box. Other than NearFA playback, the speaker also has AUX input jack for connecting other audio sources. Three AAA batteries can provide up to 15 hours playback, or you can power the Boost via micro USB. It is available for $29.31.