General specifications distance between transmitter and receiver :>10myes polar patterncardioid frequency response65 hz-15khz signal-to-noise(s/n) ratio:60 dbayes uhf frequency band:470-960mhz(depends on sku)(eu 657-662mhz)yes thd:0.5%, typicalyes dynamic range:100 db a-weighted, typicalyes transmitter transmitting power:<10 mw, typical receiver input:1/4"(6.3 mm) unbalanced receiver maximum output level:-13dbv,typical receiver rechargeable battery:lithium-ion polymer 3.7wh(equivalent to 3.7v, 1000mah) receiver charge time :2 hours /1a receiver battery playtime:up to 6 hours microphone battery4 x aa alkaline (included) what's in the box? 2 x wireless microphones 1 x wireless receiver 1 x usb-c cable 1 x quick-start guide 1 x safety sheet 1 x warranty card *free delivery city centre* cash on delivery.