Each 100% cotton t-shirt has a hidden sewn-in pocket for the small control unit. Features a variable sensitivity dial to customize the level of reactivity to sound volume. Uses 4 replaceable AAA batteries. The shirt is hand-washable (just remove the cables & driver) and comes in adult sizes Small through XXL. (XXL has a $3 size surcharge.) The sewn-on design itself is about 6" wide by 4" high.
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