The Yongnuo YN660 steps up from the YN560 IV with a higher GN66 output and a clearer LCD for on-unit group and channel control. The built-in 2.4G transceiver transmits and receives, so it drives a whole multi-flash setup without extra gear.
- Guide Number: GN66 (ISO 100 · 200mm)
- Manual + Multi modes
- Built-in 2.4G radio — transmit & receive, up to 100m
- On-unit control of remote groups A/B/C/D/E/F
- S1/S2 optical slave modes
- Flash coverage: 20–200mm (manual zoom)
- Power: 4× AA batteries
- Universal hot shoe
