Audio Tester with 3-pin XLR Male/Female Connectors, Phantom Power Check, 1/4" Speaker In, 1/8" Headphone In, and Signal Generator. Xvive's AT-1 helps you troubleshoot cables and devices with ease. Compact and reliable, it ensures optimal signal quality every time. AT-1 Portable Audio Tester Features: Signal Generator emits 1 kHz tones or pink noise audio signals XLR Cable Tester for detecting whether XLR cables are damaged XLR Input Metering to measure the strength of XLR input signals Phantom Power Check to test voltage and ensure normal operation Headphone and Speaker Monitoring to check input signals Suitable for testing powered PA speakers, effect pedals, cables, DI boxes, IEM systems, mixers, and other audio equipment