Sennheiser EW-D 835-S Set (R4-9) Wireless Vocal Microphone All-in-one digital wireless handheld set for those who sing or speak featuring Sennheiser's renowned e 835 capsule. Versatile and feature-rich digital wireless system for those who sing, speak or play instruments that allows for seamless product pairing and management via the EW-D Smart Assist App. Receive state-of-the-art live sound featuring Sennheiser?s renowned e 835 capsule on a lightweight handheld transmitter with integrated mute switch. 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. 304 g (incl. MMD 835 microphone module) Latency (ms): 1.9 ms Polar pattern: Cardioid Sensitivity: 2.1 mV/Pa Transducer principle: dynamic Transducer type: Dynamic Connection: Wireless Polar pattern: Cardioid Total harmonic distortion (THD): -60 dB for 1 kHz @ -3 dBfs input level Transducer principle: dynamic Latency (ms): 1.9 ms Audio frequency response: 20 Hz - 20 kHz (-3 dB) @ 3 dBfs Audio output level: 18 dBu max. Dynamic range ( ): 134 dB Connection: Wireless 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: 2.1 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 Weight (g): approx. 304 g (incl. MMD 835 microphone module) Length (mm): 405 Width (mm): 350 Product height: 73 Product length: 350 Product weight (g): 405 Product width: 3000 Bluetooth transmission frequency: 2402-2480 MHz