Features: Powerful Voice Amplifier: 25W high performance waterproof voice amplifier can project your voice across to a group of 20 to 300 people clearly and loudly, sound covers about 16000 sq. ft (1500? ). Personal amplifier speaker with a compact size and light weight, which is ideal for teaching, tour guides, instructors, promotion events, guitarists, conferences, moderators, lecturers, etc Multi-purpose Portable Speaker with Wired Headset: Original voice enhancer is not only a outdoor sound amplification, but also can be used as a Bluetooth speaker. With built-in upgraded Bluetooth 5.0 chip and advanced antenna design, Bluetooth voice amplifier can connect with smartphone, tablet and other bluetooth-enabled devices in a few seconds at an open area. The speaker also supports recording, loop playback, Aux input, micro SD / TF card, U disk and as a power bank for emergency charging Long Working Life & LED Display: With built-in 2pcs 7.4V 2200mAh lithium batteries, rechargeable voice amplifier could last for up to 8-12 hours playtime with half volume after fully charge. With LED digital display: The mode status and battery level status will be displayed on the LED screen, you dont need to worry about not knowing the specific usage mode and remaining battery capacity any more. Waterproof & Sturdy Design: Voice amplifier is designed with durable silicone case and great sealing interface to ensure waterproof, shockproof, dustproof, splash-proof, sand-proof. Even if you accidentally drop the speaker on the ground, no need worry it will be damaged. With compact size ( 5.44 * 2.02 * 4.26 inches) and light weight ( 1.22 lb), portable voice amplifier is suitable for outdoor / medium-size or small room, such as beach, poolside, boat, bus, classroom, office, bathroom, and so on Warm Tips: 1. The wired headset microphone is neither waterproof Mic nor Bluetooth microphone headset. 2. Please fully charge the speaker before using. 3. Please turn down the volume of the speaker appropriately to reduce reverberation. 4. Keep the distance between the speaker with Mic, do not point the headset directly at voice amplifier to prevent howling. Are you interested in a multi-purpose voice amplifier for outdoors? Are you planning to have an amazing outdoor activities, such as hiking, climbing, boating...? If yes, if you are looking for a voice enhancer, specially it has waterproof function for outdoors and indoor activites--Teaching, Training, Stage Performance, Team Building, etc. Then M900 waterproof voice amplifier is perfect for you to enhance voice volume to project voice to a small or large group to save your throat Waterproof IPX6 Rating: Portable voice amplifier suitable for beach, poolside, classroom, office, bathroom, etc Upgraded Bluetooth 5.0 Chip: Advanced antenna design with Bluetooth provides widely open area wireless range and faster connection. Voice amplifier can connect with smartphones, tablets and other bluetooth-enabled devices within few seconds to play audio file Portable power bank for emergency charging Recording: Please insert a Micro SD/TF card/USB disk (Becasue the speaker itself without any storage space) to store file and plug in the headset Mic before recording Wide Application: Powerful voice amplifier is perfect for outdoors, singing, speech, teachers, coaches, Yoga, fitness instructors, tour guides or people who has a soft voice Specifications: Bluetooth: V 5.0 Output power: 25W Charging Voltage: DC 9V, 1.2A Battery Capacity: 7.4V, 2*2200mAh battery Working Time: 8-10 hours with half volume Charging Time: 3~5 hours Sound coverage: 1500? Package: 1x Bluetooth Voice Amplifier 1x Wired Headset Mic 1x Waistband 1x 9V 1.2A charger 1x AUX cable 1x User manual