Long-lasting battery Battery capacity: 2200mAh Full charge time: 3-5 hours Playing time: 5-8 hours Loud Speaker This voice amplifier can also be used as a speaker, loud and good sound quality. You can listen to your favorite music, SD card, U disk, and PC. Radio Mode FM Frequency range: 76-108MHz. With crystal clear speaker and strong signals quality, you can tune in to your local stations for news, live baseball games, talk radio, all styles of music, and more. One key loop During playback long press the loop key, the display shows "ONE", enter the single loop mode. Long press the loop key again, the display shows "ALL", cancel the single loop mode. Selfie Mode When you are in class or as a tour guide, use the selfie function to release your hand and get a better angle to take photos with everyone, record the beautiful moment. Record Mode The recorded file will be automatically saved to the memory card, never miss any important speech information. Please make sure the TF card/USB Disk is insert before the recording. Why is this product for you? Our professional voice amplifier is a versatile and practical accessory, meant to help you make your voice heard! Being able to cover an area of 1000sq. ft. / 1000sqm, this amazing amplifier offers a crystal, clear sound, with no background noise or distortions. It has a lightweight and portable design due to the back clip, meant to help you fix the device at your belt or pocket, and waistband belt, which allows you to attach the amplifier around your waist. It can be used in meetings, large people gatherings, for school teaching, or tour guides, making sure everybody gets the information you share. And the best is yet to come, as our voice amplifier has 6 functioning modes, allowing you to record precious information, make selfies, listen to the radio or your favorite music, as it can work as a loudspeaker, as well. Make your voice heard with our professional voice amplifier! Why is this product for you? Our professional voice amplifier is a versatile and practical accessory, meant to help you make your voice heard! Being able to cover an area of 1000sq. ft. / 1000sqm, this amazing amplifier offers a crystal, clear sound, with no background noise or distortions. It has a lightweight and portable design due to the back clip, meant to help you fix the device at your belt or pocket, and waistband belt, which allows you to attach the amplifier around your waist. It can be used in meetings, large people gatherings, for school teaching, or tour guides, making sure everybody gets the information you share. And the best is yet to come, as our voice amplifier has 6 functioning modes, allowing you to record precious information, make selfies, listen to the radio or your favorite music, as it can work as a loudspeaker, as well. Make your voice heard with our professional voice amplifier!