Akg B29L Battery Operated Phantom Power Supply And Mixer B 29 L Battery operated phantom power supply and mixer for one or two microphones The B 29 L powers one or two C 4.. L version MicroMic III Series microphones (except for the D 409 L which requires no phantom power). The B 29 L features an on/off switch and status LED as well as a mic/line selector for matching the output level to the input of the connected mixer or recorder, etc. The B 29 L operates on one standard 9-V battery. Average battery life is 50 hours. Two volume controls allow you to balance the levels of the two microphones. A supplied clip makes it easy to attach the B 29 L to a belt or guitar strap, etc. Features * Powers one or two MicroMic Series III condenser L-version microphones * Provides gain control for each microphone * On/Off switch with LED status indicator * Standard XLR male output connector * Output level mic/line selector switch Specifications Power supply: 9 V-Alkaline Block Current consumption: max. 10 mA Battery Life: 50 h +/- 5 h Input channels (Mini XLR-F): 2 Max. Input level: 0 dBV Input impedance: 5 k ohm Input attenuator: -50 dB Output: XLR-M phantom power protected (max. 55 VDC) Max. output level: 0 dBV +/- 1 dB @ k Output impedance: typ. 200 ohm unbalanced Gain MIC: 0 dB +/- 1 dB Gain LINE: 40 dB +/- 2 dB Noise MIC: Frequency response: 20 to 20 kHz Temperature range: -32-¦ F - 140-¦ F (0-¦ C - 60-¦ C) Humidity: 93% @ 140-¦ F (40-¦ C) Size (W x D x H): 3.7 in. x 2.6 in. x 1.1 in. (94 x 67 x 27mm) Weight incl. batteries: 4.8 oz. (135g)