... 2:1-Receiving Frequency: -ISM 2,400 MHz~2,483 MHz-CH1=2,414 MHz;CH2=2,432 MHz-CHI=2,450 MHz; CH4=2 ... 2:1-Receiving Frequency: -ISM 2,400 MHz~2,483 MHz-CH1=2,414 MHz;CH2=2,432 MHz-CHI=2,450 MHz; CH4=2 ... MONITORReceover Frequency : ISM 2,400 - 2,483 MHzCH1 = 2,414G ; CH2 = 2,432G ; CH3 = 2,450G ; CH4 = 2,468GProduct Size ( L ... ( DC + 9V 800 mA ) Earphone 1PCS 2.4GHz Wireless receiver (2.5" TFT LCD MONITOR)