Sennheiser EW-D ME4 Set (R1-6) Wireless Lavalier Microphone All-in-one digital wireless lavalier set for those who speak featuring Sennheiser's renowned ME 4 cardioid clip-on microphone. Versatile and feature-rich digital wireless system for those who speak or present that allows for seamless product pairing and management via the EW-D Smart Assist App. With a metal housing, the robust bodypack transmitter and unobstrusive clip-on microphone ME 4 (cardioid) with high speech intelligibility suit perfectly for daily use on stage. Features Digital transmission operating in the UHF spectrum greatly enhances range, reliability and scalability Smart Assist App connects via Bluetooth Low Energy for a streamlined setup and operation at a distance Auto scan creates reliable connections with minimal time and effort 134 dB audio input dynamic range eliminates need for sensitivity adjustments and preserves every detail Elimination of intermodulation enables channels to be placed in an equidistant tuning grid 600 kHz apart 56 MHz of tuning bandwidth and equidistant spacing enables up to 90 channels 2,240 selectable frequencies allow for fine tuning Lithium-Ion battery pack (sold separately) delivers up to 12 hours of operation (up to 8 hours of operation with 2x provided AA batteries) Top Specsification Dimensions: 212 x 44 x 189 mm Weight (g): approx. 1000 g (without antennas and power supply) Latency (ms): 1.9 ms Max. sound pressure level: 120 dB Polar pattern: Cardioid Sensitivity: 40 mV/Pa Transducer principle: pre-polarized condensor microphone Transducer type: Pre-polarised condenser Connection: Wireless Connectors: 3.5m Polar pattern: Cardioid Total harmonic distortion (THD): -60 dB for 1 kHz @ -3 dBfs input level Transducer principle: pre-polarized condensor microphone Latency (ms): 1.9 ms Audio frequency response: 20 Hz - 20 kHz (-3 dB) @ 3 dBfs, 50 to 18,000 Hz Frequency response: 50 to 18,000 Hz Audio output level: 18 dBu max. Equivalent noise level (db): 31 dB Max. sound pressure level: 120 dB Dynamic range ( ): 134 dB Connection: Wireless Connectors: Ambient Conditions Operating relative humidity ( %): 5-95 % (non-condensing) Operating temperature (C): -10 C - +55 C (14F-131 F) Battery capacity (Ah): 2.3 Battery count: 2 Battery included: Y Battery voltage (V): 1.5 Charging current (mA): 300 mA Sensitivity: 40 mV/Pa Input voltage: 11-13 V- Transmission power (mA): Audio link: 10 mW ERP (Range Y1-3: 12 mW ERP) BLE: max. 10 mW EIRP Dimensions: 212 x 44 x 189 mm Height (mm): 73 Length (mm): 405 Weight (g): approx. 1000 g (without antennas and power supply) Width (mm): 350 Product height: 73 Product length: 405 Product weight (g): 2800 Product width: 350 Cable length (m): approx. 1.60 m (62.99") Bluetooth transmission frequency: 2402-2480 MHz