How to control the loudspeaker plugged into a car on and off by rf remote controller

My dad would like to plug a loudspeaker into the trunk of his car and wanted to control it by remote controller. He was wondering if it could come true because he wanted to use loudspeaker to listen to music when he went out for picnic with us. He just searched from the internet, then he chose Model 0020003(S1L-DC12 & C-2) from one remote control supplier.

It is the wiring procedure which the supplier shows to him. The red wire from the loudspeaker is connected to the C terminal of the receiver and black wire from the loudspeaker is connected to the negative electrode of the power supply. The positive wire of the supply power is connected to B terminal and positive electrode of the receiver. The negative electrode of the power supply of power supply and receiver are connected together.
When we press the button1, the loudspeaker turn on; when we press the button 2, the loudspeaker turn off.

How does the mercury switch remote control the garbage bin

I  have a mercury switch and I  intends to apply to my garbage bin. So when the truck tips garbage bin, I can know it in time. Now I am looking for a remote control kit which can connect to mercury switch to attach that garbage bin. When the garbage bin is tipped by the truck, the mercury switch is on and triggers the remote controller to turn on the light in the house. So I select this control kit which are model 0020259 S1DA-AC220 & model 0021000 C-1. S1DA-AC220 is a receiver with a timer. C-1 is the transmitter.

First, the mercury switch is supposed to be soldered to those two terminals of button.(see the following picture)

Second, this unit should be attached to the garbage bin.
Third, the power supply should be connected to the N&L terminal of the receiver.
Wires from the light should be connected to B&N terminal of the receiver. Then we use another wire connect to C&L terminal of the receiver.

We press buttons of “＋” and “－” on the timer to adjust delay time. I set 5 minutes for this timer.

When the truck comes and picks up the garbage bin, the garbage bin will be turned upside down so that the mercury will roll to another side. With connection of two wires at another side through mercury, the transmitter will send signal to receiver. After the receiver receives the signal, the light will shine and last for 5 minutes. Then the light will turn off automatically after 5 minutes. With shining of light, we know that the garbage truck tips garbage into truck and takes away.