Specifications: RF Modulation: GFSK (Gauss Frequency Shift Keying) Frequency band: 2.4G (2405-2478MHz) Frequency response: 35Hz-14KHz3dB Signal/Noise: 84dB or more Distortion: 0.05% or less (32ohm, 1 KHz, 65 mW output) FR output level: 3mW Earphone output level:32hom, 65mW Reception sensitivity: -90dB+/- 3dB / 0dB=1V/Pa, 1KHz Audio input connector: 3.5mm mini jack Operation range: 60m (197 ft)(without obstacle) Transmitter Power requirement: 2 x AAA battery(not included) Consumption power: Transmitter:3V/70mA, Receiver:3V/70mA Transmitter Size: 4.5 x 7 x 3.5cm/ 1.8 x 2.8 x 1.4in Transmitter Weight: 47g/ 1.7oz(without battery) Receiver Weight: 12g/ 0.4oz Features: Digital wireless microphone system (one transmitter, one receiver), suited for vlogging, podcasts, live streaming, mobile journalism, etc. Utilizes 2.4G wireless technology, ensuring strong anti-interference capability and high performance. Provides operation range up to 60m (197ft) in obstacle-free conditions. Equipped with an omnidirectional lavalier microphone for clear sound recording; transmitter easlly mounted to belt or pocket with the help of a backside clip design. Mini receiver featuring a 3.5mm earphone interface, supports real-time audio monitoring for clear recording and proper functioning of the microphone. Lightweight and compact enough to be packed into a backpack for convenient portability during travel. Package includes: 1x TX4 Pro Transmitter 1x BY-WM4 PRO RXD Receiver 1x Lapel Microphone 1x Windproof Cover 1x Clip 1x Matching Thimble