This handheld microphone amplifier is top-notch and delivers crystal-clear sound without any interference. Based on my observations, it has a range of up to 100 feet and is perfect for teaching, public speaking, and even karaoke nights. The battery life is quite impressive, lasting up to 10 hours on a single charge. One downside is the slightly heavier weight compared to some other microphones, but the excellent sound quality and features make it worth it.See full review