Herdio Bluetooth Wall Amplifier 4 Channels Volume Control Wall Plate USB/MIC/AUX(3.5mm) Inputs Connect 4 Speakers with 12V 3A Power Supply,HWA-16BT-4CH

EASY TO INSTALL: Versatile sound configurations are easily achieved by mounting the wall amplifier system on any wall in your home or office. Positive amplifier terminal is connected to positive speaker cable, negative amplifier terminal is connected to negative speaker cable, and up to 2 pairs of speakers are connected. 16BT-4CH combines flexibility, power and control in a compact, self-contained design.
^^ Compatible with Bluetooth: Built-in Technology allows you to stream audio wirelessly to a connected speaker system; Countroller receivers&Directs wireless audio works with all of your favorite device.
Wireless range: 30' Feet (10 Meters) ^^
Connecting Audio: Line level audio is typically supplied via the front 3.5 mm input jack pigtail leads located on the rear of the amplifier receiver wall plate ^^
Updated features: Microphone paging and speakers control made easy. USB port allow you easily access to music stored on a flash drive. Aux input port plug&play smartphones and other music device; Dual Independent 4
Channels: connect up to 4 speakers ^^
What is in the package: 1x in-wall audio receiver wall plate, 1XAC adapter, 2Xscrews.
Note: make sure The unit is properly connected to external speakers; make sure the unit is properly connected to a power source