What's in the box:

Wireless 2-in-1 Audio Receiver and Transmitter BT 5.0 Audio Adapter Dual Mode Portable Adapter Black (Standard)

Features:
BT 5.0 Chip With intelligent chip, it offers stable transmission, faster and stabler.
RX+TX 2-in-1 Design Receive RX + transmit TX 2-in-1design, free to switch to fulfil your different needs.
High Quality SoundCan avoid interference during transmission andrestore the original sound of music.
Portable Design It is small and portable, easy to carry in your backpack or laptop bag.
Strong Compatibility This receiver and transmitter adapter can be widely used on your computer, laptop, home stereo system, headphone, smartphone, MP3 player, CD player, etc.

Specification:
Model: B12S
BT version: V5.0
Support protocol: A2DP, AVRCP
BT distance: 10m(open space)
Play time: Up to 5 hours
Charging time: About 1 hour
Charging voltage: DC 5V
Input/output: 3.5mm aux port
Mic sensitivity: -42db
Compatibility: compatible with phones and Pad of Android/IOS system and allmost BT audio devices
Item size:7.5*2*1.5cm / 2.95*0.79*0.59in(L * W * H)
Item weight: Approx.17.1g /0.6oz
Package size:12.6*7.6*2.2cm / 4.96*2.99*0.87in(L * W * H)
Package weight:53.1g /1.87oz

Packing list:
1 * Receiver & Transmitter Adapter
1 * Charging Cable
1 * Double 3.5mm End Adapter
1 * User Manual