Sound To Go PLUS takes portability to a new level as an all-in-one micro speaker with a re-chargeable Lithium Battery and remarkable sound. Encased in an elegant brushed aluminum chassis, Sound To Go PLUS features a 2 channel stereo with 2 full range 1.25" drivers on each channel (magnetically shielded). It also features a built-in "Class D" amplifier and a 3" x 1.25" oval passive radiator. An auxiliary input enables the use of multiple host devices such as "smartphones" and iPads (any MP3 enabled device). Sound To Go PLUS is a self-contained portable mini speaker system that delivers exceptional audio performance above and beyond any built in laptop or tablet speaker. Sound To Go PLUS is a great solution for home, business and travel use