All specifications above are based on SEA&SEA's testing standards. Refer to the "Compatibility List" on SEA&SEA's website for compatibility between the strobe and specific cameras.

Item YS-03 YS-01 YS-D2 YS-250PRO
  YS-03 YS-01 YS-D2 YS-250PRO
Guide Number (ISO 100/m) (land) 20 20 32,
24 (with Diffuser 100 attached),
20 (with Diffuser 120 attached)
32
Beam Angle 100°x100°
(with Diffuser 110°x110°)
100°x100°
(with Diffuser 110°x110°)
80°x80°(without Diffuser),
100°x100°(Diffuser 100),
120° x 120°(Diffuser 120)
105°×105°
(with Diffuser 115°x 115°)
Batteries Only use x4 AA batteries of the same type and make (1.5V Alkaline or 1.2V Nickel-Metal Hydride). Only use x4 AA batteries of the same type and make (1.5V Alkaline or 1.2V Nickel-Metal Hydride). Only use x4 AA batteries of the same type and make (1.5V Alkaline or 1.2V Nickel-Metal Hydride). Battery for YS-250PRO
Number of Flashes*1 AA Alkaline batteries: 230 / Nickel-Metal Hydride batteries: 330   AA Alkaline batteries: 230 / Nickel-Metal Hydride batteries: 330   AA Alkaline batteries: 150 / Nickel-Metal Hydride batteries: 200  200
Recycle time (full)*2 AA Alkaline batteries: 3.1 sec / Nickel-Metal Hydride batteries: 2.5 sec AA Alkaline batteries: 2.5 sec / Nickel-Metal Hydride batteries: 1.9 sec AA Alkaline batteries: 3.0sec / Nickel-Metal Hydride batteries: 1.5 sec 1.8 sec.
Color temperature 5600K 5600K 5600K 5600K
Color temperature w/diffuser 5250K 5250K 5250K 5200K
Depth rating 75m / 250ft 75m / 250ft 100m / 330ft 60m / 200ft
Dimensions (WxHxD) 68x108x129mm / 2.7x4.3x5.2inches 68x108x129mm / 2.7x4.3x5.2inches 89x133x116mm / 3.5 x 5.2 x 4.6 inches (incl. YS base but excluding protruding parts) 107x130x223mm / 4.3x5.2x9inches
Weight 430g / 15.0oz (w/o batteries) * Fixing bolt fitted
450g / 15.8oz (w/o batteries) * Attached a fixing bolt to the Strobe. 623g / 22.0oz (w/o batteries) (inc. YS-mount and fixing bolt. Without batteries) 1,383g / 48.4oz (w/o batteries) * Attached a fixing bolt to the Strobe.
Underwater weight*3 Approx. +10g / 0.4oz(w/ batteries) Approx. +10g / 0.4oz(w/ batteries) Approx.+40g / 1.4oz (incl. batteries) Approx. +80g / 2.8oz(w/ batteries)
Others Exposure control:
Slave TTL
Slave function
Auto power OFF function
Sync cord :
Fiber-optic cable
Over-pressure relief valve
Exposure control:
DS-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
Sync cord:
Fiber-optic cable
Over-pressure relief valve
LED target light
Exposure control:
DS-TTL II, Slave TTL,
Light level control dial(GN):
1/1.4 /2/2.8/4/5.6/8/
11/16/22/32 (11 steps)
Pre-flash control:
Equipped with pre-flash cancel mode
DS-TTL II function
Slave function
Auto power OFF function
Sync cord:
5-pin Sync cord/N, Fiber-Optic Cable
Over-pressure relief valve
LED target light (output is adjustable in 2 steps)
Audible charge signal
Exposure control:
TTL,Light level control dial (GN):
0.7/1/1.4/2/2.8/4/5.6/8/11/
16/22/32 (12 steps)
Pre-flash control:
Equipped with pre-flash cancel mode
Slave function
Sync cord :
Sync cord/N, Fiber-optic cable
Over-pressure relief valve
LED target light
Test flash function
TTL / READY confirmation audible signal

*1 Number of flashes and recycle time depends on the battery brand, temperature and frequency of use. *2 Number of flashes and recycle time of Ni-MH batteries were tested on 2400 mAh batteries.
*3 As a standard, underwater weight measurements are taken in fresh water. (+) indicates the strobe is positively buoyant and floats in water. (-) indicates the the strobe is negatively buoyant and sinks in water. Weight in sea water will vary depending on salinity.
* Do not use non-recommended batteries (such as lithium primary batteries). Use of non-recommended batteries may cause battery leakage and overheating and may cause the strobe to rupture, which could result in personal injury.