Compact, lightweight, ease of carry are simply parts of reasons to this attractive PA unit. With an integrated Bluetooth function, it allows users to handle and operate on the go! Frequency band available on 520-865MHz 60W power output (max) Two-way speaker – 5” Neodymium woofer and 1” tweeter – deliver great sound projection Supports up to 4 wireless microphones to operate concurrently Duo-receiver provides SCAN function for a clear channel to use, and SYNC to target microphones at same channel as receiver USB/MP3 audio player for option Integrated Bluetooth function for audio streaming from smartphone and tablet 4-segment battery meter for charging and power status reading Voice priority allows a reduced music volume when a microphone is used Two power models – AC or Battery powered Three battery options – Lead-Acid, NiMH and Lithium, choice at budget Runs 4-6 hours on a charge (built-in battery charger) *Docking for smartphone (only GPA-670B)