Tycoon Percussion 29 Series E-Cajon - Siam Oak Body And Front Panel The first of its kind, this cajon features a built-in amplifier and speaker Bass and slap sounds are amplified beyond any typical Cajon's natural capibilities Features a speaker jack for easy plug and play with any speaker set-up MP3 jack is included, allowing musicians to play along to their favorite tunes Powered by one 9V battery (included)