I purchased this amp (and a pair Dual LU53PW 5 ¼ inch passive speakers) to replace my 15 yr. old Sharper Image wireless speaker system. The input to that setup was an 1/8 plug that went into the headphone jack of my phone. I wanted a Bluetooth amp and did not want to spend a ton of money for a garage stereo. My total was less than $100 (I already had 20' of speaker wire.)I mounted both the amp and the speakers to permanent shelves I built. It sounds great! The power supply that comes with it is 12 volts. You can use a PS that supplies up to 24 volts, but I don't think I need that, this is only a garage. If you think you want to have greater volume, the power input jack is a 5.5 mm * 2.1 mm if you're checking out other power supplies (you can purchase this amp without a power supply.)Once paired, as soon as I turn it on, it connects to my phone. If you have a lot of your own music on your phone, use the android app Poweramp to play your music. You can fine tune the sound, balance and other stuff with that app then save those setting as a preset. You then associate that preset with that particular Bluetooth connection. When I use Poweramp in my garage, the preset is automatically used (I like a lot of bass.) Pay the $5 for this awesome music app.The second one I purchased is for my covered deck. Since this is outside, I had to change speakers (the Dual speakers had reviews that say they rust when used outside.) I purchased Moukey M20-2 Passive speakers in black (my deck is stained black.) I also purchased a Sunnyglade ABS Plastic Dustproof Waterproof IP65 Junction Box Universal Durable Electrical Project Enclosure With Lock (3.9"x5.9"x2.8") in which to place the amp.I had replaced a switched, hardwired lighting system on my deck with wireless LED lights so I had a spare 120v A/C wired connection in the corner of my deck. I ran that connection into a single receptacle that is now used for my second amp. I bought the PS with the amp again, and I plugged that into the switched outlet. The DC power wire from that is run to the waterproof box. So are the wires that are connected to the speakers (see pic #4). All wires are run through automotive electrical grommets purchased locally. The electrical switch and waterproof 2 gang cover were also locally purchased (the price was the same between Lowes and Amazon.) The total cost for the deck sound system was a little over $100, as I had to buy wire, too (100' 16 gauge landscape wire from Lowes was the least expensive.)Please note that there are 3 versions of this amp. This one has a slide switch for on/off. The other two look like momentary switches and would likely not work for my deck, as I remove power from the device by cutting off the source.Since I live in a subdivision, I do not want to disturb my neighbors. The preset I saved for the deck in Poweramp has less bass so I don't really push the Moukey speakers like I do the Duals in the garage. Both speaker sets are good for their intended purpose/space.In hindsight, I should have bought the next size up for the Sunnyglade box. Everything fits, but it's kind of tight. I took a piece of oak to form a stand to hold the amp in place, but if you just stuff it into the 3.9"x5.9"x2.8" box without something to hold it in place, the volume button may get turned a bit when you close the box.If your going to match the radius of the curved sides of the amp, a 7/8" spade bit matches perfectly. Also, I painted everything to match either my house color or color coordinate to the Bluetooth items on the deck.