Electronic Drum Machine Shirt cotton Wearable DJ Quality Drum Machine Thumps out Sweet Digital Rhythms Real Working Wearable Drum Machine & Looper 9 Different Drum Kits with 7 professional grade drum sounds each Fully washable. Electronics and drum pads easily remove from shirt. Requires 4 x AA Batteries (not included) Length of T-Shirt measurement depends on size: Small 28", Medium 29", Large 30", XL 31", XXL 32", and XXXL 33"