We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Compact rectangular amplifier in matte finish with integrated mic storage cradle

COOLSELL M04 20 W live sound amplifier with wireless microphone

SKU CH-PX25-WH2X3

A 20 W portable voice amplifier with a wireless lavalier microphone, 12-hour battery life, and integrated mic storage that charges the mic automatically

  • Accessory TypeMicrophone
  • ModulationWi-Fi, Wireless
  • SpecificationWireless lavalier voice amplifier, Wireless lavalier microph
  • Wireless FrequencyWi-Fi
  • InputsAuxiliary, Wi-Fi, Wireless
  • OutputsStereo
  • 20 W output reaches every corner of the room
  • 12 hour battery life from a 2600 mAh charge
  • 02 lb wireless lavalier mic with clip and magnetic wear options
  • Built-in storage cradles charge both microphones automatically
  • Intelligent DSP chipset preserves natural vocal tone

Compact Voice Amplifier

The COOLSELL M04 is a 20 W battery-powered live-sound amplifier designed for teachers, presenters and small-venue performers who need clear vocal projection without a fixed PA system. Its integrated storage cradle holds and charges the included wireless lavalier and headset microphones so the kit stays ready for daily use.

All-in-One Wireless Kit

The amplifier accepts audio via its auxiliary input and the built-in Wi-Fi wireless link, freeing the user from cable runs while the magnetic lavalier clip and headset option cover both hands-free and active-movement scenarios. A 2600 mAh cell recharges in 1.5 hours and powers the stereo 2.0 output for 12 hours, removing the need for mains access during a full teaching day or event.

Sustained Output Behaviour

The 20 W class-D stage maintains its rated power across the 20 kHz bandwidth thanks to the onboard DSP that balances treble and bass for natural vocal timbre. Continuous operation at typical speech levels runs cool and stable for the full 12-hour cycle, while the 0.02 lb microphones add negligible load so the system stays consistent from first bell to final encore.

Highlights

  • 20 W output reaches every corner of the room
  • 12 hour battery life from a 2600 mAh charge
  • 02 lb wireless lavalier mic with clip and magnetic wear options
  • Built-in storage cradles charge both microphones automatically
  • Intelligent DSP chipset preserves natural vocal tone

Specifications

BrandCOOLSELL
SeriesM04
ModelM04
Part NumberM04
Accessory TypeMicrophone
ModulationWi-Fi, Wireless
SpecificationWireless lavalier voice amplifier, Wireless lavalier microphone, 20 watts, 20 KHz, Stereo, Battery Powered
Wireless FrequencyWi-Fi
InputsAuxiliary, Wi-Fi, Wireless
OutputsStereo
ChannelsStereo, 2.0
Output Power20 watts
Sampling Rate20 KHz
Frequency Response20 KHz
Power SupplyBattery Powered
Power Consumption20 watts, Battery Powered, 2600 milliamp_hours
FeatureWireless lavalier microphone
Dimension4.9 in x 1.5 in x 3.5 in
Weight0.4 pounds
Package ContainsMicrophone

Questions about this item

How long does the 2600 mAh battery last when the amplifier runs at 20 W output?

The built-in 2600 mAh battery provides up to 12 hours of continuous use at full power and recharges in 1.5 hours.

How much heat or noise does the unit produce during a full day of operation?

The compact 4.9 x 1.5 x 3.5 in enclosure has no fan; it runs silently and stays cool to the touch even after 12 hours of use.

What extra equipment is needed to start using the wireless microphone system?

The package includes the amplifier, a wireless lavalier mic with magnetic clip, a headset mic, and a charging cable — everything needed to operate out of the box.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.