K11 iPhone Single Microphone K11 Wireless Single Microphone for iPhone Battery capacity: 80MAH Battery life: 7-8 hours Signal-to-noise ratio: 64DBM adaptive noise reduction Small and convenient, compatible with various devices, supports mobile phones, tablets, cameras, notebooks, etc. No APP, plug and play, one-key connection, easy to wear. Intelligent noise reduction, 7 hours of long battery life, easy to deal with various noisy environments, worry-free shooting, to meet your day's needs. 360 omnidirectional pickups record every detail of the sound. Transmission distance: barrier-free 25m-35m