What's in the box:

TDA7492 Wireless Bluetooth 4.0 50W+50W 2-channel Audio Receiver Stereo Digital Power Amplifier Board Module (color1)

Sound quality is very good and it can drive 4/6/8 ohm speakers. Bluetooth V4.0, it has sufficient power output 2*50W.

Features:
Sound quality is very good by using this module.
Using CSR8635 Bluetooth chip, Bluetooth V4.0, high software compatibility.
Power amplifier chip: TDA7492 double channels sufficient power 50W, better than TDA7492P.
DIP switch for more convenience to adjust amplification gain.
With 5 buttons for adjustment, easy to operate.
Applicable speaker impedance: 4/6/8 ohm (8 ohm is the best).

Specifications:
Supply Voltage: DC 8-25V
Power Interface: 2.1 DC Socket
Audio Input: Bluetooth Receiver V4.0
Amplifier Chip: TDA7492
Output Power: 2*50W
Pre-amplification: Pre-5532
Applicable Speaker Impedance: 4/6/8 ohm
Number of Channels: Two-channel Stereo
PCB Board Size: 83 * 50mm / 3.3 * 1.97in
Weight: 51g

Package List:
1 * Bluetooth 4.0 Audio Receiver Power Amplifier Board