Portable karaoke machine for children/adults
Frequency range: 20 Hz - 20 kHz. Maximum sound level: >115 dB, 1 kHz, THD<1%. Power supply: Built-in lithium-ion battery, 3.7 V/3000 mAh. Charging voltage: DC 5 V. Charging time: Speaker: 3 hours; Microphone: 1 hour operating time: 3-5 hours sound charger effect: Original, male, female, child, magic