inputs.text: issues features - really enjoy itehem love fact battery rechargeable added series great way learn audio waves vibrations changed size shape objectsi three got thehem try thehem series see works purchase not overly expensive using thehem last two monthssince however issues followsthere no set instructions rehemove sticky pad speaker whatever attached watched video pried itehem trying four days sticky pad stronger whatever used hold head place became detached called origaudio kind sent form could send device fixed free pay shipping charges thehemthe second one no longer works work series head no longer vibrates return welloverall devices work advertised not getting sound greater internal speakers give try different box somethingi tried small boxes medium boxes boxes size fridge tried walls tables glass panes office tried cups plates soda bottles wood cardboard glass plastic paper depending used sound different love add bag tricks use whenever feel like listening music watching movies anything aroundtaz