1. Wireless microphone makes you move freely and do energetic and active performances2. The rechargeable and portable receiver only needs to charge for long time3. Plug and Play, cable-free, frequency automatic pairing, AA battery-powered handheld microphone, and 18650 lithium rechargeable battery powered receiver makes it portable (Note: batteries and 18650 batteries are not included)4. The microphone can be connected to multiple audio systems including speakers, amplifiers, wireless mic systems. Wireless microphones will give you the mobility and freedom of movement for stage performances, speeches, churches, weddings, etc.5. Signal-to-noise ratio: Greater than or equal to 70db6. Frequency response range: 100HZ-20KHzMaterial:ABScolour:BlackPackage Contents:1 * Wireless Microphone1 * ReceiverOnly the above package content, other products are not included.Note: Light 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.