ZVOX SB400 Aluminum Sound Bar with Built-In Subwoofer, Bluetooth Wireless Streaming, AccuVoice Room-filling 3D sound from a single anodized aluminum cabinet. Frequency range-58 Hz - 20 kHz. Works well with TVs from 37 inch- 70 inch AccuVoice feature uses hearing aid technology to deliver ultra-clear dialogue. Bluetooth wireless music streaming from your phone or tablet. 100-240 VAC, 50/60 Hz Built-in subwoofer with Mega Bass produces great bass without an external subwoofer. Multiple inputs make it simple to add Chrome cast Audio for multi-zone Wi-Fi streaming music.