Yongnuo YN-660 Speedlite

key specifications for the Yongnuo YN660 Speedlite:

1. Guide Number: 217’ at ISO 100 and 199mm.
2. Zoom Range: 20-199mm (14mm with panel).
3. Tilt Range: -7° to 90°.
4. Rotation: 270°.
5. Manual Power Control: Adjustable from 1/1 to 1/128.
6. Recycle Time: 3 seconds at full power.
7. Power Source: Four AA batteries.
8. External Power Port & PC Sync Port.

The YN660 is a powerful manual flash with a 2.4 GHz radio system, making it an excellent choice for photographers who want precise control over their lighting. It’s suitable for various applications, including studio work, events, and outdoor photography. This flash is not TTL-enabled; it operates purely in manual mode.