--- product_id: 250894046 title: "Fun Science Salt Water Robot Educational Toys" brand: "4m" price: "¥4224" currency: JPY in_stock: true reviews_count: 5 category: "4 M" url: https://www.desertcart.jp/products/250894046-fun-science-salt-water-robot-educational-toys store_origin: JP region: Japan --- # Salt water-powered energy 7 modular build projects Eco-friendly recycled materials Fun Science Salt Water Robot Educational Toys **Brand:** 4m **Price:** ¥4224 **Availability:** ✅ In Stock ## Summary > ♻️ Build the future with salt-powered science—because real innovation never runs out of juice! ## Quick Answers - **What is this?** Fun Science Salt Water Robot Educational Toys by 4m - **How much does it cost?** ¥4224 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/250894046-fun-science-salt-water-robot-educational-toys) ## Best For - 4m enthusiasts ## Why This Product - Trusted 4m brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Sustainable STEM Fun:** Transform everyday trash into 7 dynamic, mechanical toys that teach recycling and physics ♻️ - • **Eco-Powered Innovation:** Harness clean energy with salt water—no batteries needed, just science in action ⚡ - • **Creative Problem Solving:** Follow a 12-page illustrated guide to design and engineer your own eco-friendly robot and gadgets 🧩 - • **Hands-On Learning Experience:** Build, experiment, and master concepts like gravity, centripetal force, and chemical reactions 🧠 - • **Perfect Gift for Future Innovators:** Lightweight, ready-to-use kit ideal for classrooms or eco-conscious kids eager to lead green change 🎁 ## Overview The 4M Green Science Salt Powered Robot kit empowers kids 8+ to build seven eco-friendly mechanical toys using salt water energy and recycled materials. This STEM-focused set teaches principles of clean energy, physics, and environmental responsibility through hands-on, creative projects. Lightweight and complete with multi-use components and clear instructions, it’s a perfect educational gift that inspires sustainable innovation without plastic waste. ## Description Buy 4M Fun Science Salt Water Robot Educational Toys online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase. Review: Good Review: Funciona! É fácil de montar e funciona muito bem - o robô inclusive é bem rapidinho! Fez o maior sucesso aqui em casa e minha filha levou para a aula de ciências da escola e foi a sensação do dia! Alunos e professores adoraram! Vale muito a pena! ## Features - ♻️ Transform everyday waste into working science toys—kids build seven cool eco creations like a gravity‑powered robot, bottle tornado, and hovercraft using recycled bottles, caps, CD parts and simple connectors. - 🔧 Includes multi-use components—copper washers, rubber bands, CD connectors, plastic caps, wooden bead, string, pipe cleaners, dropper and double‑adhesive tape—designed to combine trash and imagination into repeatable projects. - 🧠 Supports STEM learning and environmental awareness—children aged 8+ learn recycling principles, mechanical motion, gravity, centripetal force and clean energy while assembling hands-on, upcycled toys. - 🌱 Encourages design thinking and creative problem-solving—kids use a 12‑page illustrated guide to repurpose real trash items and modular parts, planning and building eco toys with real mechanical function. - 🎁 Ideal for eco-conscious gifting or classroom eco-labs—lightweight, self-contained kit comes packaged as ready-to-use resource for sustainable science exploration without plastic overload. - ✅ From trusted 4M Green Science line—safe, educational materials and clear instructions blend engineering creativity with environmental responsibility in one innovative waste-to-toy system. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00AV8XBGG | | Age Range Description | Kid | | Battery Description | None (powered by salt water and charcoal) | | Best Sellers Rank | #54,146 in Toys ( See Top 100 in Toys ) #407 in Toy Robots #957 in Electronic Learning Toys | | Brand Name | 4M | | Country of Publication | Hong Kong | | Customer Reviews | 4.2 4.2 out of 5 stars (952) | | Educational Objective | Chemical reactions and alternative energy sources | | Global Trade Identification Number | 00085761178854, 04893156033536 | | Included Components | All parts to build a salt-powered robot, except table salt and spoon | | Is Assembly Required | Yes | | Item Dimensions | 6.4 x 16.5 x 21.6 centimeters | | Item Type Name | Salt Powered Robot | | Item Weight | 0.26 Pounds | | Manufacturer | 4M | | Manufacturer Minimum Age (MONTHS) | 60.0 | | Manufacturer Part Number | 3688 | | Material Type | Plastic | | Model Number | 3688 | | Set Name | Salt Water Powered Robot Kit | | Size | 1 EA | | Sub Brand | (-) | | Theme | Water & Salt Properties | | UPC | 085761178854 433599293698 696748482088 885604478369 088462687748 787551203738 | | Unit Count | 1 Count | ## Product Details - **Age range (description):** Kid - **Brand:** 4M - **Item dimensions L x W x H:** 6.4 x 16.5 x 21.6 centimeters - **Size:** 1 EA - **Theme:** Water & Salt Properties ## Images ![Fun Science Salt Water Robot Educational Toys - Image 1](https://m.media-amazon.com/images/I/71mNtK-NRZL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: What kind of functions develop this robot? What does it do?** A: It goes forward. That is it. It took my son and I about 10 minutes to build it, and it ran for about 30 minutes before the battery need to be cleaned, and rebuilt. **Q: How many watts is the LED lightbulb?** A: The power depends how fast you spin the windmill.The forward voltage drop of an LED is typically 2 to 3 V. Let's say 2.5V.A current of 20 mA (0.02A) will produce a bright light. That's probably close to what you get with a fairly strong wind turning your windmill.The power dissipated in the LED in this case is 2.5 x 0.02 = 0.05W = 50 mW. **Q: Is included the elements, for example charcoal, aluminium or salt? And is included some pieces of science kit as tube, ect?** A: It a simple kit, included small slides aluminum, carbon, works fine but is small, from kids 4 old years. Needs salt and water not included in the box. **Q: Does this only work once? My son can't get it to go a second time. Wondering what to do.** A: It will work multiple times. Make sure after each use to clean the battery parts with water and allow to dry before reassembling ## Customer Reviews ### ⭐⭐⭐⭐ Review *by E***J on 1 February 2026* Good ### ⭐⭐⭐⭐⭐ Review *by A***R on 22 August 2025* Funciona! É fácil de montar e funciona muito bem - o robô inclusive é bem rapidinho! Fez o maior sucesso aqui em casa e minha filha levou para a aula de ciências da escola e foi a sensação do dia! Alunos e professores adoraram! Vale muito a pena! ### ⭐⭐⭐⭐⭐ Review *by R***M on 19 June 2021* Birthday present for a 9 year old boy ## Frequently Bought Together - 4M Toysmith, Green Science Salt Water Powered Robot Kit, STEAM Powered Kids, Beach Toy, For Boys & Girls 5+ - 4M Green Science Solar Rover, DIY STEAM Powered Kids Science Kit, Boys & Girls Ages 5+ --- ## 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.jp/products/250894046-fun-science-salt-water-robot-educational-toys](https://www.desertcart.jp/products/250894046-fun-science-salt-water-robot-educational-toys) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-12*