3-in-1 output, suitable for iPhones, Type-C smartphones, and devices with a 3.5mm interface Automatic noise reduction, reverb, monitoring, external playback, and mute functionalities 2.4G wireless pairing, automatic connection upon startup, and easy operation Compatible with various devices such as smartphones, computers, tablets, speakers, amplifiers, cameras, etc. Specifications: Mic head: Digital microphone Input Voltage: 5V Microphone Battery: 200mAh Receiver Battery: 200mAh Battery Life: 12 hours Signal-to-Noise Ratio: 64DBM Transmission Delay: 30MS Sensitivity: -42DB Frequency Response: 20-20KHZ Transmission Distance: Up to 15 meters without obstacles Notes: 1. The laptop needs to be set to microphone input before use. 2. Only suitable for Type-C devices with OTG function (production after 2019 is better). 3. Some Android phones need to activate the "OTG" function when plugging in a USB-C receiver.