Features: 1.Adopts VHF technology, remote wireless transmission makes operation easier without annoying wires,can achieve 20m of the transmission distance. Broader frequency range, less interference,showing your voice easily and perfectly.  2.Adopts the exacting complete electronic circuit control,capture rich and full-bodied sound from sources that are directly in front of the microphone.  3.Suitable for many events like Karaoke,live performances,conference,school,hall,party,etc.  4.Can used with 3.5mm and 6.35mm female interface devices.  Also suitable for teacher teaching.     Specification: Item Name:Wireless Microphone;  Material:Plastic;  Input:2.2-3V;  Working Current:90mA (Max.);  Working Frequency:268.85MHz (Fixed);  Sensitivity:-50 +/- 3dB (0dB Equal to 1V/Pa at 1KHz) THD:Less than 0.7%;  Serial Number:More than 110dB;  Delay Time:Less than 5ms;  Frequency Response:50-18KHz;  Power Supply:2 x AA Battery (Not Included);  Operating Temperature:-10 Degree Celsius - 50 Degree Celsius;  Features: Handheld,Wireless,with Mic,Easy to Use;  Microphone Size:24.5cm x 5cm/9.65" x 1.97" (Approx.);  Audio Cable Length:50cm/19.69" (Approx.);  USB Receiver Size:8cm x 2.5cm/3.15" x 0.98" (Approx.);     Package Includes:(Battery Not Included) 1 x Wireless Microphone;  1 x USB Receiver;  1 x 3.5mm Audio Cable;  1 x 6.35mm Converter