USAMS US-SJ464 Bluetooth car audio adapter for wireless music playback, navigation messages and phone calls on car radio without Bluetooth module. Simply connect the 3.5 mm jack to the AUX socket on the radio, and the USB connector to the USB port on the radio or the car charger, then connect the phone to the adapter via Bluetooth.The adapter is compatible with the traditional speaker. When connected to the receiver, the traditional wired speaker can also wirelessly play the sound from a mobile phone / tablet / laptop / TV.- Built-in microphone, speaker- Voice messages with loud and clear navigation, safer ride- Chip Bluetooth 5.0- Stretch spring cable- Automatic reconnection. After the first connection automatically connects to the recently paired devices- Connection possibilities 3.5 mm jack: car radio, normal speaker, etc- USB port connection: USB car, laptop, power bank, chargers, etc.Specification:Material: aluminium alloy + ABS Bluetooth version: 5.0BT connection distance: ≤5 meters Transfer distance: 20 Hz ~ 20 HzSNR: > 90dBWeight: approximately 11gUntended length: 38 cmLength after extension: 150 cm (max.)