Features: Male voice to female voice; Female voice changed to male voice; sound, KTV 12 sound effects including sound; The function of bel canto/voice changer supports fine adjustment. Parameter: Signal to noise ratio: 106dB Dynamic range: 106dB Battery capacity: 250mA/3.7V Charging input: DV5V/1A Battery energy: 3.7wh Battery effectiveness: about 3-4 hours at full power Due to different batches, the appearance, color and printed words of the product , which not affect the use. Material: ABS colour: Black Package Contents: 1 x Voice Changer 1 x Audio connection cable 1 x Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.