Akk X1 VTX, it's simple to see what channel/band/mw power you are on and equally easy to change. Product description Specifications: Item name: X1 5.8Ghz 40CH AV Transmitter Modulate: Wideband FM Modulate Video Format: NTSC/PAL Output Impedance: 50 Ohm Output Power: 25mw: 12,13,14 dBm 200mw: 22, 23,24 dBm 600mw: 26,27,28 dBm Antenna connector: RP-SMA connector Operating Voltage: 7-24 V Supply Current: 25mw: 100 mA 200mw: 200 mA 600mw: 280 mA Operating Temperature : -10 +85 ℃ Video Band Width: 0-18 MHz Audio carrier Frequency: 6.5 MHz Video Input Level: 0.8,1.0,1.2 Vp-p Video Input Impedance: 75 Ohm Audio Input Level: 1.0 Vp-p Audio Input Impedance: 10K Ohm Dimension: 28.5X20X8mm Package includes: 1x 5.8G X1 transmitter 1x 5.8G antenna 1x Connector and cable set 1x Product manual