Question 1

Can I have one relay on momentary and the other on toggle or are they programmed together ( as it seems). Want a horn on one and lights on another.

Accepted Answer

Hello. Yes you can.

How to program(Mix mode)
1. Press the learning button (on the receiver) 4 times. The indicator LED on the receiver will turn off;
2. Press button "A" on the remote control. The indicator LED on the receiver will flashing several times and then turn off;
3. Press button "B" on the remote control. The indicator LED on the receiver will flashing several times and then light up. Succeed.

Repeat the Step 2 for the second remote control.

So that you can (Mix Mode)
1. Press and hold onbutton "A", relay "1" will turn on;
2. Release button "A" , this relay "1" will turn off.
3. Press button "B", relay "2" will turn on;
4. Press button "B" again, this relay "2" will turn off.

Question 2

What is the size of the enclosure for the receiver board?

Accepted Answer

Hello. The dimensions of the receiver board without box is 70*50*17 mm  (2.8*2.0*0.7 in).   
The dimensions of the receiver with box is 75*55*29 mm  (3.0*2.2*1.1 in)

Question 3

Can you use universal remotes as additional remotes on this unit please?

Accepted Answer

Hello.
If you want the receiver and remote transmitters matching, there are 3 conditions that must be met: 
      ①frequency：433Mhz
      ②The coding of the chip：1527 learning code.
      ③Rate Resistance: 180-470K
If your additional remote control matched the requests above. You can pair the remote control with the receiver.
If your additional remote control is a clone remote control. You can try to copy the original remote control.
Thank you.

Question 4

Can the range be extended if the aerial is extended?

Accepted Answer

Hello. There is an antenna on the receiver. Slightly stretch the antenna on the receiver for better signal reception. But you can not extended the antenna by adding an extra antenna. If the control range still can not fit your requests. You can purchase the strong remote transmitter. 
https://www.amazon.co.uk/dp/B09YH7SR66?ref=myi_title_dp

ASIN	B098LHS5RN
Best Sellers Rank	29,503 in DIY & Tools ( See Top 100 in DIY & Tools ) 260 in Switches & Dimmers
Brand	DieseRC
Coil Resistance	15
Coil Voltage	6 Volts (DC)
Connector Type	Screw
Contact Current Rating	10 Amps
Contact Material	Silver Alloy
Contact Type	Normally closed, Normally open
Country Of Origin	China
Current Rating	10 Amps
Customer Reviews	4.3 4.3 out of 5 stars (1,829)
Item Weight	135 Grams
Manufacturer	DieseRC
Manufacturer Part Number	Lmpyf
Maximum Switching Voltage	30 Volts
Minimum Switching Voltage	6 Volts (DC)
Model Number	2402
Mounting Type	Surface Mount
Operation Mode	Manual or Automatic
Product Warranty	1 year
UPC	750828381309
Wattage	300 watts

DieseRC DC 12V 24V 30V Secure Remote Control Switch Universal Wireless 433Mhz rf 10A Relay Receiver Board with 2 Transmitter Key fobs, for Motor, Light, Gate door, DIY Wireless Controller

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