What's in the box:

BT Receiver Wireless Headphone/Microphone Adapter with Mic BT 5.0 Dongle USB Adapter USB Dongle Replacement for P4 (Black)

Wireless Headphone&Microphone adapter delivers a wireless high-quality stereo experience using your existing BT headphones.
Features:
Adapter: USB adapter that connects to any BT audio devices when you connect your USB slotfor P4.
Microphone:It comes with a wireless microphone, which enables you to communicate when you connect the P4 controller.
High Quality:Experience every single component of your game's vibrate sound with high quality sound output.
Convenient:Simply plug and play with minimal set up to get you up and running in minutes. Easy for you to use.
Portable:Compact and portablewith small size,it's suitable for traveling and in office.

Specification:
Applicable: for P4
Operating Voltage: 5.0 V
Operation: Class 2
Output Power: 0 to 4dBm
Frequency Range: 2.4 G ISM band
BT Version: 5.0 + EDR
Receiver Sensitivity: -75dB
HCI Interface:USB 1.2/2.0
Transmission Distance: 33 feet (10 m)
Audio Decoder: 16-bit codec
BT Protocol: A2DP, HFP, HSP
Connection: Piconet/Scatternet Support
Color: Black
Item Size: Approx. 3.5cm * 2cm * 1cm / 1.38in * 0.79in * 0.39in
Item Weight: Approx. 4.3g / 0.15oz
Package Size: Approx. 10.5cm * 6.5cm * 2cm / 4.13in * 2.56in * 0.8in
Package Weight: Approx. 19.5g / 0.69oz

Package List:
1 * BT Receiver
1 * Signal Receiver
1 * English User Manual