No driver is required when used on a computer.If you are prompted that the device cannot be recognized when transmitting audio on the computer, it means that the USB port is not properly inserted.When using USB data cable to transfer audio from computer, there is no need to use 3.5mm audio cable.When transferring audio on a computer using a USB data cable, the volume of the computer system cannot be adjusted,only the volume of the playback software (music player, video player) or bluetooth-compatible speaker (Bluetooth headset) is adjustable.The device does not support voice calls or voice assistant functions.Item Name: bluetooth-compatible Wireless Music AdapterMaterial: PlasticBluetooth Version: 5.0+EDRBluetooth Protocol: AVRCP (receiver mode only), A2DPFrequency Range: 2.402GHz-2.480GHzSignal to Noise Ratio: ≥90dBBattery Capacity: 300mAh Battery (Included)Output: 5V 1ACharging Port: Micro USBPlay Time in Receiver Mode: 10 HoursPlay Time in Transmitter Mode: 7 HoursCharging Time: 1 HourWorking Distance: 10 MetersFeatures: Wireless, 2 in 1, Receiver and TransmitterSize: 7.6cm x 2.75cm x 1.15cm/2.99" x 1.06" x 0.45" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x bluetooth-compatible Wireless Music Adapter1 x Data Cable1 x 3.5mm Audio Cable1 x User Manual