Douk Audio Nobsound NS-20G 200W (100Wx2) Mini Bluetooth Power Amplifier, Multifunctional Hi-Fi DSP Stereo Headphone Audio Amp, LED Display, Power Supply (Black)

Nobsound NS-20G 200W Mini Bluetooth 5.0 Power Amplifier 2.0 Channel Wireless Receiver Hi-Fi DSP Stereo Headphone Audio Amp LED Display

Dayton Audio BST-1 High Power Pro Tactile Bass Shaker 50 Watts RMS, 4 Ohms Impedance - Turn Any Surface into a Speaker System - Generates Subwoofer Lows

Nobsound Mini Bluetooth 5.0 Power Amplifier, Stereo Hi-Fi Digital Amp 2.0 Channel 50W×2 with AUX/USB/Bluetooth Input, Wireless Audio Receiver, PC Sound Card with Power Supply (Black)