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The iSound BT-4000 Wireless Boombox lets you start a party anywhere! Impress yourself and others with incredibly bold and crisp sound. This amazing boombox is completely portable due to its built-in 2100 mAh lithium battery, offers up to 5 hours of playtime (depending on volume) and connects wirelessly to your music playing devices. The boombox features a built-in stand for your table or smartphone as well as USB and SD card slots for smooth MP3 playback. Manage your sound experience with independent bass and treble controls and enjoy the powerful bass response provided by twin full-range drivers. Choose from 3 stunning colors and enjoy its sleek and stylish retro design! Included in the box is the BT-4000 Wireless Boombox, a micro USB charging cable, a USB AC adapter as well as a 3.5mm audio cable. Additional technical specifications: Lithium polymer battery 3.7V/2100mAh, input power USB 5V (500mA or higher), play time of up to 5 hours, charge time approximately 3 hours, Bluetooth version 3.0, operating range 33ft, RF frequency range 88-108 MHz, frequency response 100Hz-16KHz, reception sensitivity FM-20dB, driver size 2x90mm, speaker output level 2.5W x 2-RMS. Enjoy and share your favorite music loud and clear anywhere you go with the all new iSound BT-4000!