Detailed Answer
FHSS (Frequency Hopping Spread Spectrum): the transmitter and receiver rapidly hop between multiple frequency points following a pseudo-random sequence, hundreds of times per second. Benefits: 1. Anti-interference (single-frequency interference only affects a very short time); 2. Anti-interception (hopping sequences are hard to predict); 3. Multiple access (different units use different sequences). The LDER LD series uses FHSS, and XINGJIA supports adaptive frequency hopping. This is the key anti-interference technology of modern industrial remote controls — be sure to confirm support when buying.
| Principle | Rapid frequency hopping |
| Anti-interference | Single-frequency jamming ineffective |
| LDER | FHSS standard |
Note:Products advertised as "fixed frequency" have weak anti-interference — be cautious in multi-unit scenarios.