Saramonic Blink 500 B4, Wireless Microphone System, Very compact 2.4 GHz two-channel wireless microphone system with 2 transmitters and 2 lavaliers, Broadcast quality for Apple iPhone and iPad, Very lightweight, battery-free, Apple Lightning MFI certified receiver, The plug-on transmitter has a built-in microphone or can be used with the supplied SR-M1 lavalier microphone, For mobile video production, vlogging, journalism and more, Range: 50 m, Frequency range: 50 - 18,000 Hz, Maximum level built-in microphone: 120 dB, Maximum level lavalier microphone: 110 dB, Sensitivity built-in microphone: -42dB, Sensitivity lavalier microphone: -30dB, Power supply: Li-Ion battery or USB-C DC 5V, Up to 6 hours of battery operation, Audio input: 3.5 mm mini jack for lavalier microphone, Dimensions transmitter: 63 x 43 x 16.5 mm, Dimensions receiver: 76 x 16.5 x 11 mm, Weight transmitter: 34 g, Weight receiver: 11 g@+*Included:*@+@+, 1 x RXDi, 2 x TX, 2 x SR-M1 lavalier, 2 x Alligator-style lavalier microphone clips, 2 x Foam lavalier windscreen, 2 x Gold-plated USB-C to USB-A charging cables, 1 x Pairing pin