Add any Surface Marker Buoy together with any Signal device and receive a 10% package discount.
Product is called Safety Pack 

From first group you have the Surface Marker Buoy's (SMB's) from Cressi, Surface Marker and Trident. You select from the large range of our SMB's with or without the WDS (Webbing Deployment System) to make sure you are visible on the surface. It is a great advantage and add safety if you can send up your SMB already from your Saferty Stop at the end of the dive for the pick-up boat to be able to spot you before surfacing. 

Additional you need to be heard so the second group you need to choose an item from is the Signal devices.
The Dive Alert Plus DV1 has the advantage over most other devices of working both underwater and on the surface by taken a small amout of air to run the device. Just connect it between your inflator hose and the inflator, no need to modify anything. This is very loud on the surface and helps when you need to get the boat crews or buddy's attention. Price: Php 6,400.00

The Storm whistle is a very powerful whistle that can be heard from a long distance on the surface. A quite unique design that make it work underwater as well but obviously not as effcient as an Dive Alert Plus.
Good when you need to call the attention of your buddy or the pick-up boat after surfacing. Price: Php 701.00

A Rattle makes it easy to call your buddy's attention underwater where you simply shake a metal ball in a metal tube. That is exactly what the Trident Aqua-Maraca is, making enough noise to get your buddy's attention.
Price: Php 735.00
The Rattle with Clip from XS Scuba is the same thing but have one addtional feature on topof the clip that make it stand out. It has a plastic cap with a magnet in that you attach to the end of the rattle to lock the metal ball in place to avoid accidental noise. Price: Php 1,923.00

 The good old Tank banger is of course a very economical option and do the job when you need to get attention underwater. Price: Php 561.00