AKG MINI WMS40 ISM 3Frequency UHF ISM 3 : 864,850 MHz (Free to use all over Europe)VocalSet Up to 30h playtime with one single AA battery Plug and Play Gain control on pocket transmitter Compatible with all AKG MicroMics Low battery indicator Smallest and lightest bodypack transmitter in its classAll WMS 40 MINI vocal and instrumental systems share the same brilliant sound and ease of use. Unique HDAP (High Definition Audio Performance) technology ensures the best possible, realistic sound at any time.The status LEDs of the receiver SR40 mini show following information: ON/OFF, link LED RF OK and audio clip LED AF clip. The output gain from the 6,3mm jack output is controlled via the volume gain switch. The included SMPS (switched mode power supply) works from 110-240V and features EU/UK/US adapters.The rugged handheld transmitter HT40 Mini offers a metal microphone cap and an ON/OFF/MUTE switch. The dynamic microphone capsule features a cardioids polar pattern.