What's in the box:

3.5mm Wireless Audio Transmitter & Receiver BT 5.0 Audio Adapter TV Speaker Headset Car Music Mini 2-in-1 BT Adapter (Standard)

Features:
Two modes with different LED light. This BT audio adapter features a LED indicator light, so you can easily distinguish different modes.
BT 5.0 Adapter. This BT audio adapter supports BT 5.0, offering you stable connection.
USB timely power supply. There is no built-in battery, and it is powered by DC 5V USB interface, no need to worry about low battery.
Small and portable.Put this transmitter & receiver into your backpack or laptop bag and take it on-the go.
Broad Compatibility. With the included 3.5mm cable, this adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc.

Specification:
Technologies: BT5.0, A2DP, AVRCP(receiver mode only)
Operation Range: Up to 10m/33ft(without any blocking objects)
Pairing name(receiver mode): BT-218
Transmitter mode: red LED light is on
Receiver mode: blue LED light is on
Material: Plastic + metal
Color: Black
Item size:3.9*1.8*0.9cm / 1.54*0.71*0.35in(L * W * H)
Item weight: Approx.20.4g /0.72oz
Package size:8.1*6.6*2.3cm / 3.19*2.6*0.91in(L * W * H)
Package weight:29.4g /1.04oz

Packing list:
1 *BT 5.0 Audio Adapter
1 *3.5mm AUX Cable
1 *User Manual