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Black and green portable voice amplifier with headset microphone and belt clip

Shenzhen Shidu Digital Technology Co Ltd

Shenzhen Shidu Digital Technology Co Ltd S278 15W portable speaker

SKU CH-TPA0-SDX7T

A 15 W voice amplifier reaches 25 to 60 listeners, runs 12 hours on a 2500 mAh charge and adds Bluetooth 4.2, recording, FM radio and TF card playback

  • Product colorBlack/Green
  • 15 W output covers 25-60 people clearly
  • 2500 mAh battery runs 8-12 hours per charge
  • Bluetooth 4.2 streams audio wirelessly
  • Records voice directly to TF card or USB
  • Lightweight belt-clip design for hands-free teaching

Voice amplifier for teachers and guides

The Shenzhen Shidu S278 is a 15 W portable voice amplifier designed for teachers, tour guides and fitness instructors who need to be heard clearly by groups of 25 to 60 people. It delivers high volume with low feedback so the speaker can talk for long periods without vocal strain. The unit also supports Bluetooth 4.2, FM radio, TF card and AUX input for playback flexibility. A wired headset microphone is included for immediate use.

Belt-worn setup with plug-and-play headset

The amplifier weighs little and ships with a waist belt and neck strap so it can be worn hands-free right out of the box. The wired headset microphone connects directly to the unit, removing any pairing steps or wireless drop-outs. Charging uses the supplied USB cable at DC 5 V 500 mA and takes roughly 3 to 4 hours for a full 2500 mAh battery. No driver installation or app configuration is required.

12-hour runtime for a full teaching day

A full charge powers the speaker for 8 to 12 hours, enough for a standard school day or extended outdoor tour. The 15 W output can project voice across roughly 10000 square feet of open space without noticeable distortion. Battery life shortens when Bluetooth streaming or recording functions are used continuously. The device is not suited for users who need all-day operation without access to a charger.

How it compares

Measured against everything we stock in Bluetooth & Party Speakers, at today’s prices. Recalculated every night.

Price $31.99
Cheaper than about 65% of the 862 comparable items (median $39.99).

Specifications

Product
Product colorBlack/Green

Questions about this item

How can I confirm the S278 is amplifying correctly after turning it on?

Speak into the headset microphone at normal volume; the 15 W output should project your voice clearly across a classroom of 25 to 60 people without feedback.

What accessories are included with the S278 and what must I provide separately?

The box contains the amplifier, a wired headset microphone, a waist belt and a USB charging cable; you only need a standard 5 V USB power source to recharge the 2500 mAh battery.

Which S278 version should I choose for a full day of teaching?

The single model delivers up to 12 hours of speaker run-time from a 3-4 hour charge, covering a full teaching day on one battery cycle.

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