SHIDU Portable Voice Amplifier 10W Rechargeable

The SHIDU SD-258 is a compact rechargeable personal voice amplifier that delivers clear 10W sound to project your voice across large rooms and crowds without straining your throat.

Built for teachers, tour guides, fitness instructors and presenters, the SD-258 balances powerful output with pocket-friendly portability. Its 10W amplifier reproduces speech and music with minimal distortion, while a built-in 1800mAh battery supports all-day use. This unit also doubles as a small wired speaker for phones or computers via its AUX input and supports TF card and USB playback for background audio during lessons or events.

How loud and how far will this amplifier carry my voice?

The SD-258 produces 10 watts of clean output designed to fill classrooms, meeting halls and outdoor groups up to roughly 1100 m² (about 11,800 sq.ft). The sound is engineered to remain clear with no whistling or buzzing at typical speaking volumes, so your voice stays intelligible at a distance.

• 10W continuous output for clear speech projection
• Coverage suitable for groups up to approximately 120 people
• Low distortion and anti-whistle design for intelligible sound

What kind of battery life and playback options does it offer?

A high-capacity 1800mAh rechargeable battery lets the SD-258 run long teaching sessions or guided tours without constant recharging. Expect up to 12 hours of amplification on a full charge and around 10 hours playing music. Charging completes in about 3–5 hours.

• 1800mAh built-in lithium battery for extended use
• Up to 12 hours voice amplification, 10 hours music playback
• Supports TF (Micro SD) cards and USB flash drives for audio files

Can I use it with other devices and how portable is it?

The amplifier includes a microphone port that doubles as an AUX input, so you can plug in a phone, tablet or computer to use the SD-258 as a wired speaker. At only around 0.36 lbs and with a detachable clip and waistband options, it’s simple to wear or carry for mobile instruction and tours.

• 3.5mm AUX input for wired audio from phones or laptops
• Lightweight design with clip and waistband hanging options
• Durable, wear-resistant exterior built for everyday use

How reliable and serviceable is the unit?

SHIDU supplies this model with customer-friendly service: a 30-day return option, a 36-month warranty, and lifetime technical support. To avoid signal interference, keep the speaker and mic separated and facing away from each other during operation.

• 30-day return policy and 36-month warranty
• Lifetime technical support from SHIDU
• Simple care tip: keep mic and speaker apart to prevent signal issues

Who is this for: The SHIDU SD-258 is ideal for educators, tour leaders, fitness and yoga instructors, coaches, presenters, and event hosts who need a lightweight, rechargeable amplifier that projects speech and plays background audio. If you teach in noisy rooms, lead outdoor groups, or want to preserve your voice during long sessions, this compact PA delivers useful power and versatile connectivity without the bulk of traditional systems.