Boya, Model – Boya BY-WHM8 Pro, Type – Cardioid, Connectivity – Wireless, Frequency Response (Hz – kHz) – 20Hz – 20KHz, Sensitivity (dB) – 80dB, Battery – 2 x AA (not included), Weight (Kg) – 252gm, Feature – UHF transmission with 48 channels, Cardioid Microphone Transmitter, A or B channel group for selection, Compatible with RX8 Pro and SP-RX8 Pro, OLED Display, Others – Channel group: A or B, Carrier Frequency Range: 576.4 MHz-599.9 MHz (Channel group: A ), 568.6 MHz-592.1 MHz (Channel group: B ), Channels: 48, RF output power: 10 mW,, Warranty – 1 Year, Country of Origin – China, Made in/ Assemble – China