Netum C Series Manual page 6

By scanning the appropriate barcode below will change the bluetooth
Transmission Speed Via Bluetooth Connection
transmit speed.
AT+HIDDLY=4
High Speed
When you plug the USB dongle to your device, USB HID-KBW feature will be
USB DONGLE AS HID-KBW
enabled by default. Then scanner's transmission will be simulated as USB
key-board input. It works on a Plug and Play basis and no driver is required.
AT+HIDDLY=25
Low Speed
$USB#KEY
*USB DONGLE as Keyboard(HID)
(5)
AT+HIDDLY=10
*Medium Speed