1200mAh battery, super long use time: 3 rechargeable and replaceable 18650 batteries, no need to buy batteries, can work for 10 hours in 3 hours after fully . The microphone display shows the battery level and signal strength in real time. The microphone and receiver have been professionally dropped and tested, with high impact resistance, lighter weight and higher wear resistance. Signal stability: The high-sensitivity professional dynamic microphone extends the working range to 160 feet (50 meters), solving the problem of wire entanglement. The VHF wireless microphone with built-in cardioid pickup pattern provides clearer signals and better sound quality, reducing the chance of interference and dropped calls. Plug and Play: Just plug the receiver into the MIC jack, the receiver automatically synchronize its frequency with the microphone, the package includes batteries, adapter plug/cable and other accessories, and it can be used after receiving it. Compatible with devices: The microphone is designed for devices with 6.35 mm (1/4 inch) or 3.5 mm (1/8 inch) MIC input. Suitable for karaoke machine, mixer, jukebox, audio amplifier, PA system, powered speaker, voice amplifier, truck speaker system Specifications: Connection range: 160 feet (50 meters). Battery capacity: 1200 mAh lithium battery Working time: 8 hours Charging time: 3 hours Frequency response: 30Hz-20KHz Operating temperature: -10-55 Colour:black Material:Aluminum Alloy How to use: 1. Put the rechargeable battery into the receiver and microphone. 2. Plug the receiver into the MIC input of the audio device. 3. Turn on the microphone and receiver. Due to different product batches, the appearance , which does not affect the use Package Contents: 1 set * VHF Dynamic Microphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.