| Model | SF-3521 |
| Transmitting chip | MR6790A |
| Working frequency | 2400~2525MHZ |
| Antenna impedance | 50Ω |
| Transmitting power | 20dBm |
| Transmission distance | Single view 150M / Quad view 100M |
| Transmission rate | 4Mbps |
| Modulation | FSK / GFSK |
| Video system | PAL：960 X 576 NTSC：960 X 480 |
| Horizontal angle | 60° |
| Resolution | 700TVL |
| Night vision | 8-10m |
| Feature | Shockproof, 2 LED lights |
| Operating Voltage | 10V~48V |
| Waterproof level | IP69K Waterproof |
| Operating temperature | -20~+70°C, RH 95%MAX |
| Storage temperature | -40~+80°C, RH 95%MAX |
