... velcro 5,4AAA or 2AAA batteries pack EL T-shirt, EL flashing T-shirt, sound active EL T-shirt, Equalizer T-shirt Product structure ... : EL panel+T-shirt+inverter+pretty individual pakcing. 1. EL panel ... Inverter: 1. Power: DC6V, DC4.5V, DC3V 2. Function: Sound active, 5 flashing, Wifi 3. Battery: Requires 4AAA, 3AAA, 2AA ...