This USB wireless Bluetooth 5.0 audio transmitter and receiver adapter is a 2-in-1 device that can easily connect to your car's aux input and allow you to play music wirelessly. The adapter has a working time of 4 hours and a battery capacity of 140mAh. It is a model C28 device that supports Bluetooth v5.0, A2DP, and AVRCP technologies, but only in receiver mode. The adapter has a charging time of 1 hour and an operation range of up to 10m/33ft without any blocking objects. It is suitable for use as a transmitter and receiver, making it a versatile device for your audio needs.