Carla bee ku918 battery how many volts

7.4V2200mAh. KU-918 main parameters Maximum output power: 35W Frequency response: ≥ 95db. sensitive impedance: 4Ω Operating voltage: 7.4V2200mAh (lithium battery). Bee megaphone KU-918 teaching tour guide promotional square dance amplified sound plug-in card plug-in U disk amplifier.