About this item A classic, reproduces the legendary voice Concert-level, beautiful sounds of nature Visible surging sound Nostalgic and retro, reinvent the classics Party Mode Two person wireless chorus One-key elimination of the original sound, both a single song and an accompaniment 10 kinds of sound effects, switch as you like High-performance DSP chip eliminates distortion and prevents howling Type-C Charging Socket can be used both negative and positive 2600mAh battery, 3 hours of battery life Wireless K song single player mode Wireless Karaoke Party Mode Bluetooth 5.0 Technical Details Bluetooth 5.0 Frequency response: 80Hz-18KHz Signal-to-noise ratio: >80dB Bluetooth transmitter power: <20dBm Bluetooth transmitter frequency range: 2.402GHz-2.480GHz Charging time: <2.5 hours (5V 3A) Use time: >3 hours