Sea&Sea YS-01 DX strobe package, complete with, DX stay, DX arm and optical cable.

• Guide Number (ISO 100/m) (land)] 20
• Beam Angle] 100°x 100° (with diffuser 110°x110°)
• Batteries] 4xAA A: 6V Ni-MH: 4.8V
• Number of Flashes*1] A: 230 Ni-MH: 330
• Recycle time (full)*2] A: 2.5 sec. Ni-MH: 1.9 sec.
• Color temperature] 5600K
• Color temperature w/diffuser] 5250K
• Depth rating] 75m / 250ft
• Dimensions (WxHxD)] 68x108x129mm / 2.7x4.3x5.2inch
• Weight] 505g / 17.7oz
• Underwater weight] -10g / -0.4oz
• Others]
  - Exposure control: DS-TTL, TTL, Light level control dial (GN): 1 / 1.4 / 2 / 2.8 / 4 / 5.6 / 8 / 11 / 16 / 20 (10 steps)
  - Pre-flash control: Equipped with pre-flash cancel mode
  - DS-TTL function
  - Slave function
  - Auto power OFF function
  - Over-pressure relief valve
  - LED target light