The WMS40 Mini Dual Vocal Set is a true plug’n’play wireless solution. Each of the two included HT40 Mini handheld transmitter features a dynamic cardioid capsule for maximum gain before feedback. Their extremely long battery life of 30 hours off a single AA battery saves money in day-to-day use. The receiver offers two balanced outputs via 1/4" jack connectors. Band BD Frequencies: 537.900 MHz, 540.400 MHz Includes: power adapter (PSU12), (2) AA Batteries Features Crystal Clear Sound: Best Audio Quality “Up and running” in a second: Plug and play solution for easy set up 30 hours of operation from a single AA size battery: Saves money in day-to-day use Specs Technical Specifications Audio frequency bandwidth: 30-20k Hz Signal to noise ratio: 107 dB(A) THD at 1 kHz: 0.8% Frequencies: 2 fixed Transmission power: 10 mW Radio range (line of sight): 20m (65 ft) Receiver audio output: balanced 6.3mm (1/4” jack) Receiver Dimensions Width: 133mm (5.24”) Depth: 132mm (5.20”) Height: 42mm (1.65”) Microphone Dimensions Length: 230mm (9.06”) Width: 52.5mm (2.07”) Not compatible in these countries: AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, NO, NL, PL, PT, SE, SI, UK