... 20Hz ~ 20000Hz 4. Shortest Latency:<0.5ms 2.4g wireless ceiling speakers Description:The ceiling installation will receive any information ... speaker, it will broken your beautiful decoration; so the wireless ceiling speaker appear in the market, it is not bad ... to choose the wireless ceiling to finish your idea.Applicable range: Salon, Supermarket, Hotel, Chain store, Subway station, Dinning-room, ...