Product Name: Battery Pack for Wireless Chairman/Delegate Unit Wireless Microphone Output Impedance: 50-1000? Wireless Technology: DSP Digital Connector(s): 5g WiFi Sound Field Force: Pressure Type Transducer Principle: Condenser Microphone Sound Channel: Stereo Directivity: Bi-direction Signal Transmission: Wireless Application: Voice, Recording, Meeting, Amplify Style: Gooseneck Microphone Weight: 1.1kg Color: Black Main Material: ABS Display: OLED Display 128* 32 Trademark: VISSonIC Transport Package: Carton Specification: 185W*130 D*50H mm (without microphone) Origin: China Product Description Battery pack for wireless chairman/delegate unitFeaturesLong life and lasting stability of charging performanceAfter fully charged it can use 28 hoursFour hours needed to fully chargeEfficient lithium batteriesFunctionsContactor by pop-up pinsBuckle housing to prevent poor contact or droppingCertificationsCE certificationItem Model for OrderVIS-WBTY1.................. Battery pack for wireless units,4900mA 8.4VDCVIS-WBTY2.................. Battery pack for wireless units,6600mA 8.4VDCVIS-WCH1.................. Charger for battery, 8 pcs VIS-WBTY1 at one time Application