USB Bitcoin Miner S3 LCD Dongle - 300KH/s USB-C Solo Miner

Our review of the USB Bitcoin Miner S3 LCD Dongle finds it best suited for beginners and hobbyists who want a low-cost, low-power way to experience solo BTC mining. The single biggest reason to consider this device is its combination of a high-efficiency ASIC chip and a 300KH/s hashrate while consuming roughly 1W, which makes it a convenient plug-and-play option for testing the mining process without dedicating a full rig or large power budget. It is a hands-on learning tool rather than a replacement for full-scale miners.

Key Features

• High-efficiency ASIC: The built-in ASIC chip delivers a claimed 300KH/s while using about 1W, allowing continuous operation with minimal power draw.
• Standalone Wi-Fi operation: It can operate as a BTC lottery miner directly over 2.4G Wi-Fi so no external computer is required for basic solo mining.
• Portable USB power: USB-A or USB-C powered design makes it easy to run from a laptop, USB hub, mobile power bank or USB charging socket for flexible placement.
• Open source: Open source firmware and software compatibility let technically minded users inspect and modify behavior or connect to custom pools.
• Multi-currency support: Although designed for Bitcoin, the device is reported to support multiple currencies, offering experimental flexibility for hobby miners.

Who It's For

This dongle is ideal for someone curious about crypto mining who wants a simple, low-cost, low-power entry point. Hobbyists, educators, and experimenters who value a compact USB device with Wi-Fi and open source support will appreciate its plug-and-play nature and modest power requirements.

It is not aimed at professional miners seeking high returns or anyone expecting a full replacement for ASIC rigs; those users should look for multi-TH/s devices with higher power envelopes and dedicated cooling instead of this USB solo miner.

Pros & Cons

Pros

• Very low power consumption around 1W for continuous, inexpensive operation.
• Standalone Wi-Fi mode removes the need for a dedicated PC during solo mining runs.
• Compact USB form factor that plugs into laptops, hubs, and power banks for flexible setups.
• Open source firmware allows customization and learning opportunities for advanced users.

Cons

• As a low-hash USB miner, it is unlikely to generate meaningful sustained income compared with larger ASIC miners.
• Solo mining success relies on chance; finding a block is rare and not guaranteed.

Specifications

Device type	USB Bitcoin miner dongle
Hashrate	300KH/s (USB solo miner)
Power consumption	Approximately 1W
Connectivity	USB-A powered; USB-C support; 2.4G Wi-Fi standalone mode
Chip	High-efficiency ASIC chip
Software	Open source firmware and compatible mining software

Our Verdict

The USB Bitcoin Miner S3 LCD Dongle is a practical, low-power way to learn and experiment with solo mining without large upfront costs. Its 300KH/s ASIC and Wi-Fi standalone mode make it a convenient educational tool and novelty device, offering good value for hobbyists though not intended for serious revenue generation.

Frequently Asked Questions

Can this run without a computer?
Yes. The miner supports standalone operation over 2.4G Wi-Fi so an external computer is not required for basic solo lottery mining.

How is it powered?
The device is USB powered and can run from USB-A ports, USB-C, USB hubs, mobile power banks or USB charging sockets.

Is the firmware customizable?
Yes. The product is open source, allowing users to inspect and modify firmware and connect to custom mining setups.