SENNHEISER ADN-W D1 Table microphone Conference wireless Features: The ADN-W D1 wireless delegate unit offers excellent speech intelligibility and ease of use. Powered by the exchangeable ADN-W BA battery pack, the unit offers more than 20 hours operating time. The delegate unit features a microphone key that functions either as an on/off switch or as a request-to-speak button. The unit is equipped with a high-performance broadband twin loudspeaker system for decentralized sound reinforcement. A screw-on microphone socket is provided to connect a super-cardioid ADN-W MIC gooseneck microphone (available in different lengths and frequency responses). The wireless delegate unit with its battery pack can be charged in the ADN-W CASE UNITS or using the NT 12-50C DC power supply. Specifications: Width 7.2", Length 7", Height 2.6" Frequency response 100 Hz to 14.5 kHz Weight approx. 2.07 lbs Charging time approx. 4 h Operating temperature 5° … +45° C RF output power 25 to 100 mW Operating time approx. 20 h with battery pack Power supply 7.4 VDC via ADN-W BA Antenna connector Inbuilt PCB antennas with pattern diversity Frequency range 2.4 / 5.1 - 5.9 GHz Headphone output level 50 mW / 16 Ω Max. coverage area 30 m / 100ft to ADN-W AM Operating relative humidity 20 … 80% Audio quality 16 bit / 32 kHz