inputs.text: neat gadget - pros claims surprisingly well ive tried multiple surfaces performance decent anything isnt solid dense material cardboard boxes work best experience bigger box better drywall also decent stick directly wall theyre made drywall course metal also amplifies sound well get weird metallic ring whatever youre playing gee wonder p wont spoil fun wanting experiment ill stop hereto use apply piece supplied 3m disks thick doublesided tape essentially three supplied driver unit stick end whatever youre using amplify sound dont worry tape isnt permanent comes firm pull tape loses stickiness wet fingers rub dust dirt surface drying stickiness returns magic 3minternal rechargeable battery huge plus increases usage time saves battery costscons novelty item dont expect replace decent set speakers cable driver unit main body little short around 6\\other device around 15\\ diameter 3\\ long curious onboard volume control well