1.3 IN 1 interface audio adapter,3.5mm aux and type-c audio port work for the devices with that interface.Type-c female port for charging. 2.Bluetooth 5.4 audio receiver and transmitter adapter, 2 in 1 Bluetooth mode can meet the needs of different devices.You can use the Bluetooth audio receiver help your wired speakers or headphones from mobile phone or tablet.The Bluetooth transmitter mode is designed to help devices without Bluetooth connect to Bluetooth headphones or speakers to . 3.Connect 2 devices at the same time under receiver or transmitter mode 4.Built-Min,support handsfree in receiver mode 5.Built-in 200mAh battery,after full charging,can keep working within 6-10 hours Miniature and portable, with a retractable interface for easy travel and carrying. Color: Black Material: ABS Package Contents: 1 x 5.4 Audio Receiver Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.