Wireless BT Karaoke Set with Double Wireless BT Microphone for TV Set Top Box Computer Smart Phone Black Karaoke Box Item Type: Karaoke SetKaraoke box color: Black BT version: V5.0 Chip: 8048A Effective distance: 30M Microphone material: Aluminum alloy+ABS Karaoke box material: ABS+UV+plating Microphone pattern: Cardioid Karaoke box port: USB sound card, HD input, SPDIF input, 3.5mm input/output,  Frequency range: 750MHz-769MHz Frequency response: 20Hz-17.5KHz Receiving sensitivity: 99dBm-82dB Dynamic range: ≥100dB Transmitting power :≥100dBm Microphone size: 23 x 4 x 2.2cm /9.06 x 1.57 x 0.87in Karaoke box size: 15.5 x 8.5 x 4cm /6.1 x 3.35 x 1.57in Karaoke box weight: 170g/6oz