student class recording megaphone little bee loudspeaker teacher lecture loudspeaker outdoor speech stall selling

beige [louder/anti-howling/long endurance]] pink [louder/anti-howling/long life]] black [louder/anti-howling/long endurance]]

standard: get head-mounted headset free flagship: bluetooth + power doubled + free strap luxury: bluetooth + power doubled + belt + head-mounted headset exclusive: super endurance + smart anti-whistle + get pearl chain free recording: recording loop + intelligent anti-whistle + send memory card top configuration: super endurance + intelligent anti-whistle + send pearl chain + recording card