Power Of Voice Amplifiers The 5-10W output power should be sufficient for 30-80 students like kindergarten classes 10-16W for 80-120 students. Outdoor teaching and large classrooms will need 18W and up. Read more Get Your Message Across Clearly Built with professional audio processors to amplify your voice and ensure everyone around you hears you loud and clear . Enhancing even the faintest of voices with minimal effort… Easy to carry, simple to wear… Package Includes: 1 * Voice Amplifier 1 * Wired Headset Microphone 1*Quick wall charger 1 * Type-C Charging Cable 1 * Aux Cable 1 * Adjustable Waistband 1 * Product Brochure Product Information The YOCEWECA Personal Voice Amplifier is a brand new voice amplification system that is sensitive enough to amplify dramatically even the faintest of voices for up to 10 hours. With an 20 watt digital voice amplifier providing high power audio output and clear sound quality, the user can control the volume of their own voice in different environments, indoors or outdoors. Easy to use Small, discreet & lightweight Low acoustic feedback with inbuilt noise filtering Read more S208 Portable Voice Amplifier S619 Portable Voice Vmplifier M800 18W UHF Wireless Voice Amplifier S398 YOCEWECA Voice Amplifier M900 25W Portable Waterproof Voice Amplifier Output 10W 16W 18W 20W 25W Battery Capacity 2000 mAh 2200 mAh 4400 mAh 2500 mAh 2200 mAh Microphone Wired Mic Wired Mic Wireless Headset Mic Wired Mic Wired Mic Sound Coverage 6500 sq.ft 9500 sq.ft 10000 sq.ft 13000 sq.ft 15000 sq.ft Bluetooth ✓ ✓ ✓ ✓ ✓ Waterproof × × IPX5 × IPX6 Size 3.35*4.72*1.57 in 3.94*1.57*3.35 in 3.66*1.65*4.57 in 5.5*4.1*1.57 in 5.44*2.02*4.26 in Weight 0.43lb 0.45lb 0.85lb 0.76lb 1.22lb