Features: 1. Dual Wireless Microphones: The dual wireless microphone karaoke device contains two wireless microphones. The karaoke machine acts as a microphone charging station and can be easily at the same time. The speaker and microphone will automatically connect when powered on. The microphone has an interesting voice changing function. 2. Long battery life: The karaoke speaker system is equipped with a high-efficiency rechargeable battery, and each microphone is equipped with a rechargeable battery, which can play for 4-5 hours after a full charge. Use the included to easily charge the machine. 3. Wide compatibility: The portable speaker supports playing music through Bluetooth compatible connection, USB port, AUX port or TF card. More connection selection modes. 4. Interesting voice changer: Five interesting sound effects: male to female, female to male, baby voice, voice and voice, meet more needs and bring more fun to use. The variable voice microphone is suitable for car karaoke, home, , classroom, speech and outdoor activities Parameter Description Support smartphones and tablets of and Android systems. Speaker power: 10W Signal-to-noise ratio: 60dB Frequency response range: 40~ 20KHZ Audio source interface: 3.5mm stereo headphone plug Battery: Built-in 1500MAH lithium battery in the host, 500MAH each in dual Bluetooth microphones Charging time: 1~3 hours Playing time: 2-4 hours at medium volume after full charge Power adapter requirements: Output voltage: 5V Current 1A/2A Function: Play MP3 format music in U disk/TF card, connect mobile phone or tablet karaoke via audio cable (not included) or Bluetooth, use as microphone for speech Material: Plastic colour: Black Package Contents: 1 x Speaker 2 x Microphone 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.