What is it?

This is a compact, ultra-portable CW (Morse code) practice oscillator specially designed for manual keys, including straight keys, side-swipers (cootie keys), and mechanical semi-automatic keys (bugs). It produces both audible tone and synchronized LED feedback, helping HAM radio enthusiasts develop or refine their sending rhythm and technique anywhere, anytime.

Why did you make it?

We created this manual Morse code trainer with one key idea in mind: make CW practice truly portable, convenient, and accessible. Traditional practice oscillators are either bulky, power-hungry, or require special equipment. We wanted something that fits in your pocket, runs off a standard power source, and supports all types of manual keys without compromise.

Whether you’re a beginner learning your first dits and dahs or an experienced CW operator fine-tuning your fist, this trainer lets you practice in a clutter-free, efficient, and satisfying way.

What makes it special?

Ultra-Portable Design

The entire unit is smaller than a standard eraser and thinner too. You can easily slip it into your pocket, pencil case, key case, or laptop bag without noticing it's there. Compared to the size of most keys, this trainer is practically invisible, yet it holds the power to level up your CW game.

Universal TYPE-C Power Input

Forget battery hassles or rare cables. This CW trainer uses a widely available USB Type-C interface for power, meaning you can use your smartphone charger, laptop charger, power bank, or even plug it directly into a computer. It’s perfect for both indoor and outdoor use, making it ideal for portable operators, SOTA activations, field days, or everyday practice at your desk.

Audible + Visual Feedback (Tone + LED)

The trainer generates a classic CW tone via an onboard buzzer and also flashes a bright green LED in perfect sync with your keying. This dual feedback mechanism enhances rhythm training by appealing to both your auditory and visual senses. Beginners will benefit from the instant rhythm recognition and correction, while advanced users can visualize their personal style and improve consistency.

Wide Key Compatibility

Whether you use a vertical straight key, a horizontal cootie key, or a vintage mechanical bug, this unit supports them all. No extra adapters, no settings—just plug in and go. It adapts to your preferred keying style so you can focus entirely on your Morse.

Plug and Practice — No Setup Needed

It’s a true plug-and-play trainer. Just connect your key, plug in power via Type-C, and you’re ready to go. No software, no tuning, no guesswork.

Key Product Features

Product Category: CW Morse Code Oscillator, Morse Key Trainer, Ham Radio Accessories Power Input: USB Type-C (5V) – compatible with most chargers and USB ports Form Factor: Smaller and thinner than a typical eraser – ultimate portability Feedback: Audible tone via buzzer + synchronized green LED visual indicator Key Support: Straight keys, side-swipers, semi-automatic mechanical keys Build: Lightweight, durable, and built for field or home use Use Cases: CW rhythm training, bug key practice, portable operating prep, ham shack accessory

Note for Beginners

If you’re just getting into HAM radio or Morse code, this is the perfect first trainer. It’s simple, responsive, and makes learning fun. Just connect your key and start tapping. You’ll develop rhythm faster with tone and light feedback, and the trainer’s size means you can practice wherever inspiration strikes — even on the go.

Note for Experts

Veteran CW ops will love how this trainer works with high-quality manual keys and doesn’t require any complicated setup. It’s ideal for daily warm-ups, precision timing training, and visualizing keying style. Best of all, it won’t clutter your bench or require heavy batteries.