The Sea & Sea YS-40A has been engineered exclusively for the Sea & Sea MX-10 camera. It is ultra light, compact and easy to use. No dials, no decisions, it automatically delivers clear, colorful pictures. The YS-20A also features an infrared optical triggering system to synchronize the strobe with the camera shutter; there are no cords or cables and therefore no chance of flooding at the flash connection.
A strobe mount on the MX-10 allows quick and easy attachment of the YS-40A.
| Configuration | Strobe for Sea & Sea MX-10 only |
| Guide No. | 49 Surface |
| Power Rating | Not specified |
| Coverage Angle | 80° |
| Depth Rating | 150 ft (45.5m) |
| Flash Modes | Auto |
| Exposure Control | ISO 100 Auto & ISO 400 Auto |
| Slave | Infrared |
| Targeting Light | No |
| Audible Signal | No |
| Color Temperature | 5500° K |
| Recycle Time | 5 Sec alkaline, 3 sec ni-cad |
| Flashes (Full Power) | 100 with alkaline bateries |
| Power Source | 4x AA batteries |
| Dimensions | 3.9 x 3.3 x 7.6" (100 x 83 x 192mm) |
| Weight (Land) | 1.1lb (485g) |