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Sennheiser Battery power supply, powers one 12 volt AB (T-powered) microphone. Battery life approximately 30 hours using a 9 volt alkaline battery. Battery test, attenuation (0, -10, -20 dB) and low frequency rolloff (20, 80, 140 Hz) controls (19.0 o
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Amazon.com: MPF Products 600mAh AHB622540N01 Battery Replacement Compatible with Sennheiser HD 4.40, HD 4.50, Urbanite XL, Momentum 2.0 Wireless Bluetooth Headphones : Electronics
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Sennheiser B5000-2 - - Battery pack for all SKM5200 and SKM5000 variants, requires (2) AA batteries, operates SKM5200 transmitters for 7.5 hours (Hi power) - 13 hours (Lo power)
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