The RF-Video AMP-18M / 24 High Gain Amplifier is high-quality small amplifier for any receiver (not for transmitters). It increases the gain of your receiver and eliminates the need for adding large 2.4 GHz antennas. You can connect any 2.4 GHz antenna to the input connector. This low-noise amplifier gives you an extra 18 dB gain in the 2.4 GHz band. The output connector is of the male SMA type. Its 9 V battery lasts for 14 to 20 hours.