Description AKG WMS40 Mini Sport Set ISM 2 Wireless System Set with Headset for Speech and Singing. Registration and fees are not required. Easy to use (Plug’n’Play). The WMS40 Mini Sport Set is versatile and user-friendly. It consists of a receiver, pocket transmitter, and headband microphone. Operating the WMS40 Mini Instrumental Set requires no prior knowledge - just unpack, turn on, and get started. The wireless system is registration-free and fee-free (ISM frequency band). The receiver has a robust metal housing and is very compact. On the front, there are control LEDs for the operating status (On/Off), wireless reception, and overload. The volume control allows you to adjust the level of the 6.3 mm jack output. HDAP technology (High Definition Audio Performance) ensures high sound quality and secure transmission of the audio signal. The pocket transmitter is particularly small and lightweight. With just one AA battery, it can operate for up to 30 hours.