describefeature: Using the latest UHF wireless technology, low power consumption, stable signal, strong anti-interference, plug and play. The high-sensitivity microphone picks up sound clearly and prevents noise. It can receive signals within 30 meters. Ergonomic design, comfortable to wear. Made of ABS plastic, moisture-proof, corrosion-resistant and environmentally friendly. It can be widely used in various occasions, such as tour guides, supermarkets, training, company meetings, organizations, etc. Built-in lithium polymer battery, one full charge can work for a long time. Specification: Transmission method: UHFFrequency Response: 50Hz-15kHzFrequency range: 625-642.1MHz, 645-662. 7MHzAudio output: Mixed outputMicrophone battery capacity: 400mAh polymerBattery Receiver Battery Capacity: 400mAh Polymer BatteryBlackPacking size: 23.5*21.5*4 .5cm/9.25*8.46*1. 77inPackage Weight: 226 g / 7.97 oz