| A21 F21-E1B Transmitter Parameters |
| Material | Glass-Fiber PA |
| Enclosure protection class | IP65 |
| Frequency range | UHF:425-446 MHz |
| Transmitter power | ≤10dBm |
| Transmitter power supply | 2 AA alkaline batteries (not included) |
| Safety code | 32 bits (4.3billion) |
| Temperature range | -40ºC-+85ºC |
| Control distance | up to 100 meters (it is available to customized long distance up to 200m) |
| Size | 156x61x51mm |
| Weight | 255g (without battery) |
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| A21 F21-RXC Receiver Parameters |
| Material | Glass-Fiber PA |
| Enclosure protection class | IP65 |
| Frequency range | UHF:425-446 MHz |
| Receiver sensitivity | -110dBm |
| Receiver power supply | 12V, 48V, 220V, 380V(optional) |
| Safety code | 32 bits (4.3billion) |
| Temperature range | -40ºC-+85ºC |
| Cable length | 1.65m (Other length can be customized) |
| Output contactor capacity | 8A sealed relay output (with AC 250V/10A relays, 10A fuse) |
| Size | 205x86x80mm |
| Weight | 620g |