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Product Features:




![]() | Transmitter's Parameters: F21-4D-TX | |
| Material | Glass-Fiber PA | |
| Protection level | IP65 | |
| Frequency range | VHF:310-331 MHz; UHF:425-446 MHZ | |
| Transmitetr power | ≤10dBm | |
| Transmitetr power supply | 2 AA batteries | |
| Safety code | 32 bits(4.3 billion) | |
| Temperature range | -40℃~+85℃ | |
| Controlling distance | Apprax*100m | |
| Size | 156*61*51mm | |
| Weight | 255g(without battery) | |
![]() | Receiver's Parameters: F21-4D-RXC | |
| Material | Glass-Fiber PA | |
| Protection level | IP65 | |
| Frequency range optional | VHF:310-331 MHz; UHF:425-446 MHZ | |
| Receiver sensitivity | -100dBm | |
| Receiver power supply optional | 18~65 AC/DC; 65~440V AC/DC(optional) | |
| Output contactor capacity | 8A sealed relay output(with AC 250V/10A relays, 10A fuse) | |
| Cable length | 1.65m(Other length can be customized) | |
| Safety code | 32 bits(4.3 billion) | |
| Temperature range | -40℃~+85℃ | |
| Size | 205*86*80mm | |
| Weight | 620g | |









A: Yes, we are professional manufacturer of boiler and pressure vessels in Henan, China.
Q: Do you have any Certificate?
A: Yes. Our boiler have got China GB ISO certificates and CE certificate of EU. We also can provide ASME, GHOST and other necessary certificates if you need.
Q: How can I pay you?
A: T/T, Western Union, Money Gram and Ali Trade Assurance is better.
Q: What about the delivery time?
A: 5-10 working days for single machine, and 30-40 working days for bulk order and door to door delivery service is also available.
Q. What about the warranty?
A: We provide 1 year warranty for free and life-long time maintenance
Q. What about installation?
A: We provide 1 or 2 technicians overseas services for installation, debugging and training.
Q: How can you ensure the quality?
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