Please check this video to see how exactly it works: 

http://www.youtube.com/watch?v=CQNn2ajL4gU&feature=related 


• Description 
This sound activated T-shirt has an electro-luminescent (EL) panel on the front. The light panel is attached to the front of t-shirt. The EL panel is very sensitive to music and any surrounding sound. The colorful lights will dance with music and show a visual rhythm. It is a perfect T-shirt for any evening parties and concerts. The EL panel can be detached from the shirt. It is connected to a battery box using a 1/4'' wide cable. The control box is placed inside of a small pocket of the T-shirt. 
• Features 
1. The sound sensitive EL panel will flash with surrounding sound and music. 
2. On/off switch Sound sensitivity control 
3. T-shirt is made from 90% cotton and washable after the EL panel being removed. 
4. Battery pack fits into a small interior pocket inside of the shirt. 
5. 2xAAA batteries required (not included). 
6. Battery pack is removable, shirt must be hand washed. 
7. Good for music and dance concert and sports fans. 
• Specification 
LED color: Multi-colors shown as in the picture 
T-shirt color: Black 
Fabric: 90% Cotton 
• Instruction 
Put batteries into the controller box and connect the battery pack to the shirt. Hide the small battery pack in the hidden pocket. Switching it ON. The sensitivity control allows you to adjust the sensitivity depending on the volume of the music and surrounding sound. 
Washing instruction: 
1. Remove battery pack and the whole power cord carefully before washing 
2. Dry Clean or hand wash only 
3. Do Not submerge any part of the flashing panel 
• Package include 
1 X T-shirt attached with EL panel
1 X Sound Control Box and cable (about 23'' long and 1/4'' wide)