1.Rechargeable replaceable batteries,10 hours of work with a full charge within 3 hours. 2.The microphone display shows the battery level and signal strength in real time. 3.The microphone and receiver are professionally drop tested for high impact resistance,lighter weight and higher abrasion resistance. 4.The high-sensitivity professional dynamic microphone extends the working range to 160ft (50m),which solves the problem of tangled wires. 5.Just plug the receiver into the MIC jack,the receiver automatically sync its frequency with the microphone,batteries,adapter plugs/cables and other accessories are included in the package and ready to use when you receive it. Working distance: equal 50M Signal-to-noise ratio:72DB Distortion:0.5% Product size:handheld 255mm/receiver 115mm Product weight:handheld 162.5g/receiver 55g (net weight) Working temperature:-10C-50C Working voltage:3.7V Battery:6-12W/-150MA Colour:Blue Material:Plastic + Metal Package Contents: 1 x Receiver 3 x Rechargeable batteries 1 x Adapter 2 x Anti-slip rings 1 x Data cable 2 x Microphone 1 x English instruction manual