Review on 🎵 Icstation Programmable Sound Module Button Control 8M MP3 WAV Music Voice Player Board with Speaker for DIY Music Box, Greeting Card & Creative Gift - Perfect for Children's Day by Vivek Allen

Very neat product. Depending on the size of your MP3 file, you can get well over a minute. The only real problem I had was that there were no instructions included with the kit. Because of this, I don't have a clear idea of what the switch does. At first I thought this would switch the device from PC available to battery powered, however the onboard storage was available in either position. When I applied 5V DC the device didn't start until I flipped that switch. In one position it accepts DC power from the cables, and the power LED is off by default (to save power I assume) and only blinks faintly during playback. I haven't tried adjusting the volume. Another review said it's possible, but that's loud enough. The MP3 I wanted to play was quieter than the standard MP3 it came with, so I recompiled the file with a louder standard sound. The volume increases the power consumption. See actual measurements below. The strangest thing about this device was the mode where it was connected to a PC (where you download the MP3 file). The LED light would come on to show it was on, but I had to fiddle with the cable a bit to register it. (I have a very good cable so I'm pretty sure it was the connector.) I'm using Windows 10 so it might work on this system. The weird thing was that when I connected it to a computer, I couldn't start it at first, even though the memory was "seen" and the LED was lit. However, when I started unplugging the micro USB cable, the device was loosened enough to NOT be recognized as a drive by the computer. Suddenly it started playing when I pressed the button. I want to see instructions. Whether it's a weak link or an intended feature. I have no idea but I can work with it and it's pretty reliable. Where the DC wires are, there is a 5V pad. These are the connections I used for all my testing. There is also a set of pads labeled 3.7 VDC. Current to which no wires are connected. I have no idea what it is for. Is this an alternate DC? Is that a DC output? I suppose I should have checked when I had counters. Spring. In any case it would have been 5 stars if it had come with a manual with specs. The device current draw is 60mA maximum (from standard MP3) and around 30mA nominal. Using a variable DC power supply, I've seen it work up to about 2.9V DC. I ordered a cheap LIR2450 coin cell battery and charger. This should work for several hours (DC 3.6V, rated 120mAh). I get a battery holder from ebay. Revain is slightly more expensive. Looking at the specs of the LIR2032 (3.7V DC, 35 mAh nominal, 70 mAh max) it will probably run a lot shorter, but still at least an hour. Update: I downloaded the instructions! Point 3 is still not explained, but I have a little more information. 3.7V DC Cable The power is for a lipo battery, and the manufacturer says it charges the battery when the micro USB is connected and powered on. Hooray!