IMPORTANT NOTES: The device must be connected to a power source during use (use the supplied USB-C cable); Not Compatible with USB Headphones; Does Not support reverse operation; It Does Not charge external devices; Is Not a signal converter; Not Compatible with Bluetooth speakers; Cannot be connected to mobile phones; Cannot be connected to laptops/PCs; Does Not allow connecting USB speakers to the TV; Does Not support iPods or devices requiring decoding | NOTE: Only compatible with car audio systems (AUX connector) and with 3.5 mm connectors on older speaker systems. (Audio only, unidirectional use, does not support reverse operation) | HOW TO USE IT: 1. Insert your USB flash drive containing MP3 music files into the USB port. 2. Connect the adapter to a USB power source. 3. Plug the AUX plug into the AUX input of your car | ONLY SUPPORTS MP3 MUSIC FORMAT: This device only supports the MP3 music format. (No additional decoding by the car is required). USB MEMORY FORMAT: NTFS formatted USB drives are not supported. FAT32 and exFAT formats are supported (Recommended small capacity USB flash drive: 8G) | PRODUCT SPECIFICATIONS: Length: 10.8 inch, Width: 1.65 inch