Andoer Mini 8 Multi Voice Changer Microphone Megaphone Loudspeaker Make your sounds more louder. Change your voice from male to female or female to male freely. It can change to 8 kinds of different voices: Male (3 types), Female (3 types), Robot, and Original. Can work with MP3, MP4, cell phone, and computer. Suitable for teaching, tour guiding, sales promotion, and speech, etc.Low power consumption. Two lithium batteries, long battery life, up to 8 hours, charging low voltage protection function.