Specifications:

Input: 220/240ac; 50/60Hz; not including microphone

A robust compact design, transistorized 500mW Audio Amplifier with large inbuilt loudspeaker (75mm X 60mm). Comes complete with mains switch; volume control for speaker and output terminals; separate loudspeaker; on/off switch.

Microphone jack input 2.5mm (15mV); 4mm sockets (150mV)

Outputs: 4mm sockets for CRO etc.