A very, very tiny, rechargeable bike light that could have other uses. But what's not about this one is that it's not just white or red. it's red, green, blue, uh, and white. So it can do a whole range of colors. Let's Zoom down this because, well, that's something where you're going to see it. it is. Tiny So this thing unfortunately has 31 modes and you have to cycle through them on. Some of those modes are incredibly useless. Let me start by turning it on by doing a long press on this. I Should have warned you, it's going to strobe. There is going to be strobing. Uh, quick double strobes. They're so brief the camera isn't picking them up. This is good because I can see them to the naked eye and that's going to result much better battery life. Second press: much longer duration flashes. third press: uh, continuous fight. and then it does the same for red, green, blue, yellow, magenta, cyan. and then after that, it goes into white. flash one red Flash Quite long duration. they're being picked up in the camera. Then it goes into uh, flashing all the colors. Then it goes into flashing all the colors slower, bigger gap between them, which could be quite good for longevity. And then it does the most awful thing ever. Uh, let me think, what's the next mode in this? Okay, it's now gone into the SOS mode, but it's actually SOS so it's not SOS but it's now going to do that in every color it can muster. So if you particularly wish to have a pink SOS light, then this could be it. Well, a pink, so so so loud. Okay, that's enough to turn it off, press and hold. It comes a little rubber bands for attaching it to your bike frame and it also comes with what appear to be velcro pads I'm guessing yes, they're velcro pads for sticking onto surfaces as well. Claims to have a 90 milliamp hour rechargeable battery and it's got a little micro USB port and a connector here. I've left on full white. Maybe it just didn't like the high current, but it went dim very quickly and when it went, um I put it on charge and only took uh, what was it about 35 milliamp hour capacity? I'll do the test again, but I'll do it fairer by not leaving it in full way. It only lasted minutes before it was actually dimmed way down because the white is very intense when you put in charge. It charges at 350 milliamp, which is quite high for such a small cell, but as a result, it does charge quite quickly. Let's open it. So out comes the spodger. Uh, discussions recently. lots of clones of these. The Isisamo spudger. Um, one place you can probably get it and they're not a sponsor and neither is is a Samo is I fix it. You can probably get the real thing there. I Would expect them to sell the real thing. Well, that comes apart quite easily. It comes apart absolutely totally easily. Here it is right. Well, that is a very very very very tiny little cell that's one of the tiniest cells I've seen. Could be useful in its own right in devices that require tiny cells. Uh, initially, I'm seeing the back four transistors, which surprises me. the chip that controls them, The two LEDs a little charge controlled chip and the button. Okay, well, you know what happens now. I'm going to take a photo of this and then we can examine it and reverse engineer it one moment. please. the reverse engineering is complete. Let's Zoom down onto this and take a good close look at the circuitry. I've got both sides the circuit board visible here. They're not flipped, there's no need to flip them. And besides, because there's components on each side, it just makes it easier to look at in this particular scenario. So we have the USB connector at this end and we have a charge control chip. It says Ltho Lth7 equivalent to type chip. It has two 50 50 LEDs with red, green, blue, and white chips. The uh, the white chip is actually a thin layer of phosphor over a blue or Violet emitter and there's two of those in parallel. We have a little push button on this side. This circuitry is so simple. And then we have the microcontroller, the classic eight pin with the sort of Pic 12 layout, so there's options to reprogram if you wish. well to replace it with a different Mac controller and then it's got four of my favorite transistors, the Chinese favorite, the A2shb are ridiculous little mosfet and then one, two, three, four resistors and the majority of their 4.7 ohms except for one which is 10 ohms, 4.7 for green, blue and white, 10 ohm for the red. and then there are 10 K resistors to pull the gates of the mosfets down to the zero volt rail effectively to make sure they're turned off when not needed. Let us bring in the schematic. The Lithium cell is currently on a test cycle just to see what its capacity is. It's not looking good. I Think it really is 30 milliamp hour. The USB connector is here. It's a classic arrangement of this classic charge chip with a 1K resistor. I mean all the components have chosen are what you'd call Textbook 1K resistor for the LED A single red LED that just shows its charging. a 3K resistor sets the charge current. in this instance, 350 milliamps which is quite high for the little dinky. What? I think is a 30 milliamp hour cell. I Shall put a note down in the description seeing what the capacity of that came out at at the end of the test. There are two decoupling capacitors on the 5V input and the output to the lithium cell. I've shown them to avoid drawing lines down the drawing of showing them connected to the zero volt rail which is this little Mark here, the sort of ground reference the zero volt reference of the circuit. the microcontroller has its connection to the directly across the lithium cell. It's got a button going to the zero volt rail. It has then four of these circuits which is the two LEDs in parallel one resistor either. 4.7 ohms for the majority of colors, but 10 ohms for the red because it's got a lower forward voltage of about 2 volts as opposed to three volts to others. And then it's got the mosfet. It's driving the gate directly via the microcontroller pin, but with a 10K pull down resistor to make sure they're turned off at other times. I tested the currents. they're ridiculous if you put it in static mode. the white is 190 milliamps. Keep in mind that's a little 30 milliamp hour cell. it goes down quite quickly. This was tested at 4.2 volts on the bench power supply. red was 150 milliamps, green was 130 milliamps, blue is 150 milliamps, and then when you chose colors like sand magenta, yellow, cyan was 300 milliamps which is about 10 times the capacity 10 times at the C value of that lithium cell. magenta was 310 milliamps which was the highest and yellow was 290 milliamps. However, when you put it into the mode and this is what I'd recommend if you've got one of these where it just does that so well. You saw it when I was testing it that the camera is barely able to catch up. That's it. Did it. Strobe that is so low that they meet the bench power supply. It's uh, it didn't really show any consistent current for that I'd Guess it's probably just a couple of milliamps. And in that sense, if you put it to that very brief double pulse strobe mode, the Lithium cell is going to last a decent length of time. uh, anything else worth seeing? Not really. There's not really much to say about it because it is a tiny little thing. Uh, but that is it. The Little Bike Light: I Mean in the sense, if you use it in that double stroke mode, it's going to last a decent length of time on a charge and the bite. The constant white mode is useful for a brief use as a flashlight, but the battery will go down very quickly. All the other modes are really gimmicks, but they include them anyway as a novelty as a selling feature, which is kind of counterproductive to its actual function. but that is it. The little, uh, strap-on That's not the correct wording to use. The little strap-on uh, rechargeable Bike Light I Mean when it's using strobe mode, it's actually okay. It's pretty good.