The PL463BL is a 4"x 6" Three-Way Tri-axial Speaker System.PRODUCT FEATURES:
Microphone Sensitivity: 72dB;
Directivity: Unidirectional;
Frequency Response: 100 to 10, 000Hz;
Operating Voltage: 1.5 DC for Transmitter 3V DC for Receiver;
Effective Distance: 15 to 30 m.