cheap baseball caps with logo 

-bluetooth 3.0v

-led indicator
-build in mic
-rechargeable li battery

specification:

-Bluetooth type : Bluetooth 3.0 receiver

-Transmission distance : 10 Meter
-Frequency Response: 20HZ---20KHZ
-USB : High speed USB2.0
-Power : built in lithium rechargeable battery
-Using environment : -40°C -- +70 °C
-Play time : 6-8 hours

-Blue/Red LED lndicating

-Simple&Unique,Convenience Design
-Packing: Poly bag / gift box