--- product_id: 3994388 title: "Earbuds Ear Buds Earphones with Microphone Mic Wired Noise Isolating Headphones Earbuds Stereo in Ear Ear Buds Earphone Android Smartphones Tablet Laptop 3.5mm Black" brand: "kootek" price: "FREE" currency: ARS in_stock: false reviews_count: 6 url: https://www.desertcart.com.ar/products/3994388-earbuds-ear-buds-earphones-with-microphone-mic-wired-noise-isolating store_origin: AR region: Argentina --- # Earbuds Ear Buds Earphones with Microphone Mic Wired Noise Isolating Headphones Earbuds Stereo in Ear Ear Buds Earphone Android Smartphones Tablet Laptop 3.5mm Black **Brand:** kootek **Price:** FREE **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Earbuds Ear Buds Earphones with Microphone Mic Wired Noise Isolating Headphones Earbuds Stereo in Ear Ear Buds Earphone Android Smartphones Tablet Laptop 3.5mm Black by kootek - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/3994388-earbuds-ear-buds-earphones-with-microphone-mic-wired-noise-isolating) ## Best For - kootek enthusiasts ## Why This Product - Trusted kootek brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description ## Images ![Earbuds Ear Buds Earphones with Microphone Mic Wired Noise Isolating Headphones Earbuds Stereo in Ear Ear Buds Earphone Android Smartphones Tablet Laptop 3.5mm Black - Image 1](https://m.media-amazon.com/images/I/61OeQRy5c9L.jpg) ![Earbuds Ear Buds Earphones with Microphone Mic Wired Noise Isolating Headphones Earbuds Stereo in Ear Ear Buds Earphone Android Smartphones Tablet Laptop 3.5mm Black - Image 2](https://m.media-amazon.com/images/I/81JWwhnQrhL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ Good value but poor documentation *by N***7 on Reviewed in the United States on December 20, 2013* I agree with the other review, the solder is not the cleanest but it is opto-isolated from your microcontroller. The relays are heavy duty and the board is quite solid. No documentation was included, but this board appears to be the same as SainSmart 8 channel relay controller.To use it, you need to supply 5v (VCC) and ground (GRD) to the respective pins. It's a 'LOW ACTIVATED' circuit, meaning you need to connect each pin to ground to activate the relay. Use a resistor and NPN transistor in combination with a pulldown resistor to activate each channel. Raspberry PI uses 3.3v and Arduino outputs 5v, so you'll need to adjust the resistor accordingly. Also, Arduinos have an internal pulldown resistor so only PI users need to add it.Wiring example circuit: [...]I also found the schematics here: [....]Hope this review helps others. ### ⭐⭐⭐⭐ Addressing more than one of these boards *by A***W on Reviewed in the United States on May 18, 2014* I have an Arduino Duo R3. I bought 3 of these boards. With 8 channels each and only 13 digital I/O I planned to use the VCC as a way to address each board. This method is unreliable since the I/O pins do not provide exactly what the boards are looking for in a VCC source. To accomplish using 3 boards and applying the same 8 channel signals to each board, I had to buy a 4 channel board as well. I used the 3 inputs that I tried to address the boards VCC and instead used those signals on the 4 channel board. And applied an external 5V source, to ensure that each board receive the power it needed. the 4 channel board conned the 5v source to the VCC on the 8 channel so that only the correct 8 channel board was on. ### ⭐⭐⭐⭐ Extremely Loud, But Works Great for What it Does *by J***4 on Reviewed in the United States on March 28, 2017* Man is this loud. So loud. If you're looking to automate home appliances or anything you use on a daily basis, look away from the mechanical relays (or at least this one). That being said, I use mine for Halloween effects so I could care less how loud it is since it's hidden away in my garage. Does as advertised. Easy to use and wire. DO NOT WORK WITH ELECTRICITY IF YOU DON'T KNOW WHAT YOU'RE DOING. And even then, be sure to check your connections before you fire this baby up. But if you know what you're doing and want a cheap way to switch DC household items on and off, this is for you. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/3994388-earbuds-ear-buds-earphones-with-microphone-mic-wired-noise-isolating](https://www.desertcart.com.ar/products/3994388-earbuds-ear-buds-earphones-with-microphone-mic-wired-noise-isolating) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-10-27*