P13 karaoke wireless microphone speaker set Reverberation mode: echo sound effect reverberation Transmission distance: ≤10 meters without obstacle Frequency response:100Hz-10KHz Working Time: 4-5 hours Speaker battery: 1200MAH;Microphone battery:500MAH Functions:Four voice changing effects, one click elimination of original sound, bluetooth5.3/TF card/AUX/USB/Type C port connection