BTS-53
Volume +/- Mode Button (Switch between Bluetooth, USB, MicroSD card reader and AUX-IN )
Slowly flashing blue.
Frequency bands: 2402-2480MHz Maximum output power:4dBm Omega 5A, Soeften DK-8382 Hinnerup Denmark BTS-53 Omega 5A, Soeften DK-8382 Hinnerup Denmark