Bluetooth 2.0 module is built in the left shade of hat, so you should put the spy earpiece in your left ear, in order to get clear sound.

It pairs with Bluetooth phone in 10 meters of distance.

It uses a small button to control (pairing, on/off).

Built-in rechargeable battery offer ~3 hours of working time and long standby time.

Built-in microphone for two way communication.

Package Includes

1 x Bluetooth inductive hat (cap).
1 x Spy earpiece (Black or skin color)
1 x Charger (with stand of your country's electric outlet).