Koss BT540i Full Size Bluetooth Headphones User Manual
Koss BT540i Full Size Bluetooth Headphones User Manual Bluetooth Discovery Move switch to the center to power on blue (flashing) Hold the switch to the left for 4 seconds to…
Koss BT540i Full Size Bluetooth Headphones User Manual Bluetooth Discovery Move switch to the center to power on blue (flashing) Hold the switch to the left for 4 seconds to…