Happy Store XD - 30 Digital Phase-locked Loop Frequency Stabilization On-board Wireless Microphone MCU FM FM Stereo Emission Module
Installation dimensions: 33 mm x 14 mm * Operating voltage: 1.9-5.5 V * adjustable frequency range: 75-108 MHZ * antenna connection mode: can separate, default is connected to the audio input line (or lines) phone * Frequency regulating mode: button/Eight level volume control, good sound quality