Echo and Voice Changer EffectWireless karaoke microphone has an excellent metal filter head and three layers of high-density noise reduction to reduce noise and dust interference. Built-in 2 high-quality large speakers, professional tuning system, adjustable echo length effect, can bring 360-degree super surround feeling,immersive!Moreover The microphone comes with a voice changer effect, you can also change your voice to male voice, female voice, baby voice, etc. Two Ways ConnectionBluetooth Connection & Cable Connection. Simply connect your phone to wired or Bluetooth, and then open the singing APP on your phone. The built-in clearly audio and vividly sound effect can make you listening and singing anytime and anywhere. Long Playing Time & High Compatibility Built-in 1800mAh rechargeable battery with long lasting. 5-10 hours of continuous usage with a fully charge.Supporting micro TF card max to 32GB(NOT INCLUDED) and song switch. The Bluetooth has a great distance of connection(10M), which can support Android, iPhone, iPad, iOS and all Smart-phones. 100% GUARANTEE: We are committed to providing each customer with the best quality products and the highest standard services. Full refund or replacement is available if you are not satisfied with our products, Please be assured of the purchase.