Details: BY-WM4 Pro-K3 is specially designed for Lightning iOS Devices. It consists of one body-pack transmitter (TX4 Pro), wireless receiver with a Lightning connector (BY-WM4 PRO RXD) Feature of BY-WM4 Pro System Ideal for Youtubes, vloggings, facebooks, podcasts,mobile Journalisms and more Digital 2.4 GHZ frequency band Dual-channel wireless receiver Ultracompact and miniature-size for receive Super-clear recording sound Up to 60m( 197ft)operation range( without obstacle) Monitoring sound by 3.5mm headphone output Master volume contro Selectable stereo and mono mode(For BY-WM4 PRO RXD RXU only) Omnidirectional lavalier microphone Standard camera shoe mount and clip included(For BY-WM4 PRO K1 BY-WM4 PRO-K2 only) Hard case included Compatible with smartphones, DSLR cameras consumer camcorders, PCS etc (For BY-WM4 PRO K1 BY-WM4 PRO-K2 only) Compatible with smartphones, tablets, laptops(For BY-WM4 PRO-K3 K5 only) BY-WM4 Pro System RF Modulation: GFSK(Gauss frequency Shift Keying) Frequency band: 2.4GHz (2405-2478MHz) Frequency response: 35HZ-14KHZ+-3dB Signal Noise: 84dB or more Distortion: 0.05% or less(320, 1 KHZ, 65mW output) RF output level: 3mW Earphone output level: 32 ,65mW Reception Sensitivity: -90db + -3db 0db=1V Pa, 1KHz Audio input connector: 3.5mm mini jack Operation range: 60m(197ft) without obstacle Power requirements: TX4 Pro RX4 Pro: 3V DC(Two AAA size batteries) BY-WM4 PRO RXD: Supplied by iOS device Plug: BY-WM4 PRO RXD: Apple MFi Certified Lightning Connector Consumption power: receiver: 3V 70mA transmitter: 3V 70mA Dimension: TX4 Pro RX4 Pro: 45*70*35mm (1.8*2.8*1.4 ) BY-WM4 PRO RXD: 82×30.7x12mm(3.2×1.2×0.5 ) Weight: TX4 Pro RX4 Pro: 47g (1.7oz) BY-WM4 PRO RXD: 12g(0.4oz)