Description from Thomann :
Rumberger TA3000 X- L. Descant microphone system for 120 bass- accordion and harmonica. elegant metal housing, power-on/off (mute) button, extremely low power consumption, ready for wireless operation, simplest usage uniform sound pickup, absolutely overload-proof, integrated filters (EQ s) for optimal sound, three separately adjustable, signals (treble, bass, vocals), input for optional vocal microphone,extremely low transmission of structure-borne sound,two-channel, configurable, output,battery status indicator. Powered by battery: 1,5 V Alkali AAA, Operating time: approx. 20-25 h. Polar pattern- descant: Sphere, Transmission range: 50 20.000 Hz, Output impedance: 600 Ohms, Output level: max. 0 dBu, Weight: 240 g, Length: TA3000X-L: 43,2 cm, Number of microphone capsules: TA3000X-L: 6.