What's in the box:

Audio Receiver Transmitter Bluetooth 5.0 AUX RCA 3.5MM Jack USB Music Stereo Wireless Adapters for Car TV PC Speaker (Standard)

Features:
This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses.
Transmitter mode: Wirelessly transfer audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers.
Receiver mode: Wirelessly transfer audio from your BT-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones.
With the included 3.5mm cable and 3.5mm to 2RCA cable, this Receiver Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc.
Switch between transmitter and receiver modes with the simple push of a switch. Effortlessly connect using advanced BT technology and 3.5mm audio cable (included).

Specifications:
Model: KN321
Technologies: KN321: BT5.0, A2DP, AVRCP (receiver mode only)
Operation Range: Up to 10m / 33ft (without any blocking objects)
Pairing name:KN321
Charging Time: 2 hours
Working Time: RX: 6 hours ; TX: 5 hours
Battery Type: Li-Polymer (200mAh)
Dimensions: 44 44 12mm
Weight: 18g
Package Size: 18 * 12 * 1cm / 7.1 * 4.7 * 0.4in
Package Weight: 65g / 2.3oz

Package List:
1* Audio Transmitter/Receiver Adapter
1* Micro USB Power Cable
1* RCA Cable
1* 3.5mm Aux Cable
1* User Manual