Mini Wireless receiver - 2.5" TFT LCD Monitor Built-in Lithium Battery Working ... :20 sets/ctnmeas: 43.0 x 34.0 x 39.5 cm-Power Supply: AC-DC adapter (DC >6V ... x 39.5 cmWIRELESS RECEIVER - 2.5" TFT LCD MONITORReceover Frequency : ISM 2,400 - 2,483 MHzCH1 = 2,414G ; CH2 = 2,432G ; CH3 = 2,450G ; CH4 = 2,468GProduct ... : AC-DC ( DC + 9V 800 mA ) Earphone 1PCS 2.4GHz Wireless receiver (2.5" TFT LCD MONITOR)