AC/DC Voltage Sensor - This product detects the presence of an AC or DC voltage. An output indication is provided for DC voltages = ± 1.5V and AC voltages = ± 1.5V p-p for frequencies = 10Hz. Max. input voltage is ± 24V - Ideal for detecting high voltage via AC wall adapters, phone ringing, or controller logic levels - Power supply is not required when used w/ the GC-100 - Optically isolated and clamped by transient voltage suppressor for circuit isolation and protection - Cable/Connector - 1,8 m, 3.5mm stereo plug