● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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Premium 0.8m power cable with USB-A to DC 2.5mm x 0.7mm connector. Features high-purity copper core for stable 1A+ current delivery. Ideal for tablets, fans, and hubs.
Reliable power delivery for your micro-electronics. The USB to DC 2.5mm x 0.7mm Charging Cable bridges the gap between modern USB power sources and classic DC-powered devices. With a length of 0.8 meters, it provides the perfect balance between reach and portability, making it an essential accessory for charging tablets, small LED lamps, USB fans, and network hubs.
Probots ProSpec Grade Reliability This cable is Probots ProSpec Grade, constructed with "National Standard" high-conductivity copper cores. Unlike cheaper alternatives that use thin strands leading to voltage drops, this cable maintains a stable voltage even under current loads exceeding 1A. The outer jacket is made of reinforced, flexible PVC to prevent fraying at the connector joints, ensuring a long service life even with daily use.
Input Connector: USB Type-A Male
Output Connector: DC Barrel Jack (2.5mm Outer Diameter / 0.7mm Inner Diameter)
Voltage Rating: 5V DC
Current Capacity: > 1A (High-purity copper core)
Cable Length: 0.8 Meters (Approx. 2.6 feet)
Internal Material: National Standard High-Purity Copper
Outer Material: Flexible PVC (Black)
Tablet Charging: Compatible with many older or specialized tablets that use a small DC pin instead of Micro-USB.
Portable Electronics: Powers USB-driven desktop fans, Bluetooth speakers, and small digital clocks.
Networking Gear: Ideal for powering 5V network switches or HDMI splitters from a USB port.
Unlock New Capabilities (Project Evolution)
Feature Upgrade: The high-current capacity allows this cable to be used with Power Banks to run 5V projects in the field, providing a reliable mobile power solution without needing a wall outlet.
Effort Level: Beginner. Simply plug and play; no configuration required.
Package Includes:


What does "2.5mm * 0.7mm" mean? This is the size of the DC tip: 2.5mm is the outer diameter (OD) and 0.7mm is the inner diameter (ID).
Is this cable compatible with 12V devices? No, this is a direct pass-through cable intended for 5V USB power sources.
What makes "National Standard Copper" different? It refers to standardized high-purity copper that ensures lower resistance and higher current carrying capacity.
Can it handle more than 1A of current? Yes, it is rated to safely carry currents exceeding 1A without overheating.
Will this work with my specific tablet? Please measure your tablet's DC port; 2.5mm x 0.7mm is a very common size for older 7-inch and 10-inch tablets.
Can I use this for data transfer? No, this is a dedicated power/charging cable and does not contain data lines.
Is the connector "center-positive"? Yes, standard USB to DC cables are wired center-positive (5V on the inner pin, Ground on the outer sleeve).
How long is 0.8 meters? It is approximately 80 centimeters or 2.6 feet.
Can I plug this into a computer USB port? Yes, but remember that most computer USB 2.0 ports are limited to 0.5A; use a wall adapter for 1A+ needs.
Is the cable jacket durable? Yes, it uses a reinforced PVC jacket to withstand bending and daily wear.
Why is my device charging slowly? Ensure your USB power source (adapter or power bank) is capable of outputting the current your device requires.
Does it fit the Nintendo DS? No, the original DS/DS Lite uses proprietary connectors.
Can it power a Raspberry Pi? Only if your Pi setup uses a 2.5mm x 0.7mm DC jack (standard Pi uses Micro-USB or USB-C).
What is the color of the cable? It is standard matte black.
Does the tip have a "yellow" or "black" end? This depends on the batch, but the dimensions remain 2.5mm x 0.7mm.
Is it compatible with 5V LED strips? Yes, if the strip uses a 2.5mm x 0.7mm barrel connector.
Can I use this with a 9V USB step-up converter? Only if the converter has the correct female USB-A output.
Is it safe to leave plugged in? Yes, provided the power source is regulated and the device is in good condition.
What is the weight of the cable? It is very lightweight, approximately 22 grams.
Does it include the wall plug? No, this is the cable only.
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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