How long does it take to fully charge the built-in microphone and what is its working time?

The built-in microphone fully charges in 1 hour and has a working time of 5 to 7 hours.

What is the output power of the W WINBRIDGE Bluetooth 5.0 Voice Amplifier?

The output power of the W WINBRIDGE Bluetooth 5.0 Voice Amplifier is 20W.

Questions & Answers: W WINBRIDGE Bluetooth 5.0 Voice Amplifier with Wireless Mic Headset, Waterproof Wireless Voice Amplifier, 20W Loudly Portable Megaphone PA System for Teachers, Safety Drills, Outdoors Indoors,M801G

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W WINBRIDGE Bluetooth 5.0 Voice Amplifier with Wireless Mic Headset, Waterproof Wireless Voice Amplifier, 20W Loudly Portable Megaphone PA System for Teachers, Safety Drills, Outdoors Indoors,M801G

POWERFUL VOICE AMPLIFIER - The voice amplifier adopts UHF transmission, 20W output powerful, clear, low feedback and no noise & distortion original sound. More importantly is automatic connection function of microphone and amplifier has been upgraded, you never have to manually reconnect again.
SUPERB BATTERY LIFE - Built in newest upgraded rechargeable batteries, Mic fully charge is only 1 hours, working time upgraded to 6 hours;Voice amp fully charge is only 3 hours, working time upgraded to 15 hours;Besides, the microphone and speaker come with a power save mode. Greener and more durable!
BLUETOOTH WIRELESS VOICE AMPLIFIER - Built with the newest Bluetooth 5.0 chip with EDR technology, this Bluetooth voice amplifier ensures a faster and more stable connection than Bluetooth 4.0, TWS Feature support Pair 2 speakers together for 40 watt stereo sound.
WATERPROOF VOICE AMPLIFIER WIRELESS- The Portable PA System is rugged enough for outdoor/indoor use and rigorously tested to meet IPX5

$98^.76 –