The Califone PA-10B-M is the handheld wireless microphone for the PA10 portable sound system, The handheld transmitter features an On/Off switch and power indicator LED, A unidirectional capsule minimizes off-axis feedback and ambient noise, The PA-10B-M is powered with two AA alkaline batteries, The rugged construction and overall sound make the transmitter an ideal solution for general presentations and speech capturing, SKU: CAFI216