1. [Ergonomic Design] The excellent design of our wireless microphone fits your hand perfectly, making you feel more comfortable.2. [Rechargeable and Long-lasting Life] 2600mAh rechargeable multi-protection lithium battery ensures longer singing time. Charge faster and have longer battery life.3. [Stereo Surround] Combined with echo mode, our karaoke wireless microphone can bring surround immersion.4. [Memory Card and Long Range] Bluetooth Karaoke Microphone supports memory card (not included) and song switching. Long Bluetooth connection distance (10m/32.8ft)5. [Multipurpose and Compatible] The karaoke machine has a built-in high-quality Bluetooth module that can be used as a speaker, player and recorder, and is compatible with various singing applications.Product functions & featuresDynamic microphone coil, DSP chip, dual-microphone duet, voice changing effects, ear monitor (mesh head with plastic cover) -------------------------------------------------- ------------------Pickup: Dynamic microphoneSpeaker power: 4 5W*2 (speaker output)Frequency response range: 3 0Hz~20KHzMaximum sound pressure level: >115dB 1Khz THD