Depending which voltage you buy. 5 or 6v version can be put into a free channel of the receiver by adding a servo plug and the 9v version can be connected to the battery wires.
You can also get the led only:
50pcs 5mm Red Diffused Round Self Flash Flashing LED Blink Bright Leds Light New | eBay
And determ the right resistor and connect it with a servo wire.