This makes it easy to be heard without straining your voice. With its lightweight design, long battery life and clear, crisp amplification, the Amp-Up™ Personal Amplifier is a winner and a must-have for teachers, coaches, lecturers, speakers, and others! When you’re speaking to a group of people, school audiences or at outdoor events, you need to be clearly heard, and Amp-Up™ packs a lot of punch with quality sound and easy-to-use controls. Amp-Up™ has top-mounted button/dial controls, making it easy to adjust the sound volume, change to different modes and turn the unit on and off. With its 40 multi-channel feature, Amp-Up™allows for up to 40 different PA-25W units to be paired and operated simultaneously near each other without creating any channel conflict between wireless head-worn microphones and their main amplification units. Amp-Up's™ auto-pairing feature will automatically pair to an available channel to avoid interference, when using multiple units. This auto-pairing continues for up to 40 channels. Using Bluetooth technology, you can stream audio/music content from your Bluetooth-enabled device. Also, play content from a USB/TF card or via AUX-IN. Amp-Up™ Wireless (PA-25W) comes with a UHF wireless headworn microphone, a carrying strap and a waistband hook for hands-free use. With its 40 channel auto-pairing feature eliminating interference and conflicts when using multiple PA-25W units near each other; amplification that’s perfect for classrooms, conference rooms, small gatherings and more; clear, crisp sound: durable and wear-resistant ABS plastic housing; ergonomic, comfortable, stylish design; easy-to-read LCD screen; built-in, high capacity Lithium-Ion battery, Amp-Up™ is the MUST-HAVE personal gadget every teacher, professor, coach, speaker, leader and many others need. Supports up to 40 PA-25W devices that are paired/operated near each other, without conflicts. • Automatically pairs, when using multiple units, to up to 40 available channels. Easy-to-Use; Lightweight • Amplification that’s perfect for classrooms, conference rooms, small gatherings and more • Clear, crisp sound • Durable and wear-resistant ABS plastic housing • Ergonomic, comfortable, stylish design • Wireless headworn microphone • Playback from any Bluetooth-enabled device, USB/TF card or via AUX-IN • Easy-to-read LCD screen • Built-in, high capacity Lithium-Ion battery • Output Power: 25W max./15W RMS • Supports up to 32GB memory media card which can store approx. 500 hours of voice data