Rolton K400 Headworn Microphone & Portable Voice Amplifier Kit

Whether you're leading a classroom, guiding a tour, hosting a meeting, or running a promotion, the Rolton K400 Voice Amplifier Kit keeps your voice clear, crisp, and effortlessly projected — no straining required. This compact all-in-one kit pairs a professional omnidirectional condenser headset microphone with a powerful >5W loudspeaker in a palm-sized design you can clip to your belt and forget about.

What's in the Box?

1 × Rolton K400 Loudspeaker
1 × 1200mAh Detachable 18650 Battery
1 × Professional Wired Headset Microphone
1 × USB Charging Cable
1 × Waistband Belt Clip
1 × Instruction Manual

Key Features

Powerful 5W+ Audio Output — Projects your voice clearly across classrooms, meeting rooms, and outdoor spaces
Long Battery Life — 1200mAh detachable 18650 battery delivers up to 8 hours of continuous use at moderate volume
USB Charging — Charges via any standard 5V USB charger (mobile phone charger compatible; 500mA+ recommended)
USB & TF Card Music Playback — Doubles as a portable speaker; play music directly from a USB drive or TF/microSD card
Omnidirectional Condenser Mic — Captures your voice naturally from any angle with a small-diaphragm condenser transducer
Wired & Reliable — No Bluetooth dropouts or pairing hassles; plug in and go
Knob Volume Control — Simple, tactile dial lets you adjust volume on the fly without fumbling through menus
Ultra-Compact Design — 8.5 cm × 8.5 cm × 3.4 cm (approx. 3.3" × 3.3" × 1.2"); fits in a pocket or clips neatly to your waistband

Technical Specifications

Audio Power	>5W
Battery Capacity	1200mAh (Detachable 18650)
Playback Time	Up to 8 hours (50–80% volume)
Charging	Standard USB 5V (≥500mA)
Microphone Style	Headworn / Headset
Microphone Type	Condenser, Omnidirectional
Connection	Wired
Media Playback	USB Drive & TF Card
Dimensions	8.5 cm × 8.5 cm × 3.4 cm
Country of Origin	Made in China

Perfect For

Teachers & Educators
Tour Guides
Corporate Presenters & Trainers
Event Hosts & Promoters
Fitness Instructors

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For guidance on safe audio listening levels, visit the CDC's Hearing Loss Prevention resource.

Frequently Asked Questions

Q: What is included in the Rolton K400 Voice Amplifier Kit?

A: The kit includes the K400 loudspeaker unit, a 1200mAh detachable 18650 battery, a professional wired omnidirectional headset microphone, a USB charging cable, a waistband belt clip, and an instruction manual — everything you need to start amplifying your voice right away.

Q: How long does the battery last on a single charge?

A: The 1200mAh battery supports up to 8 hours of use. At 50–80% volume, you can expect approximately 4–8 hours of continuous operation. The battery is detachable and charges via a standard 5V USB cable, making it easy to swap or recharge using a regular phone charger.

Q: Can the Rolton K400 play music as well as amplify my voice?

A: Yes! In addition to voice amplification through the wired headset microphone, the K400 supports USB disk and TF (microSD) card playback, so you can play background music or audio files directly from the unit.

Q: Is the headset microphone compatible with other amplifiers?

A: The included wired condenser headset microphone uses a standard connection. While it is optimized for use with the K400 amplifier, it may be compatible with other amplifiers or audio systems that share the same input type. Check your other device's specifications before connecting.

Q: Is this voice amplifier suitable for outdoor use?

A: Yes. The K400 is designed for versatile use in both indoor and outdoor settings — including classrooms, tour group walks, outdoor promotions, and more. Its compact, belt-clip design makes it easy to carry and use hands-free in any environment.