The AP Valves SMBCi is a delayed surface marker buoy with a built in self-inflating cylinder to inflate the dSMB quickly and easily. Simply open the valve of the 0.1L cylinder attached to the dSMB and let it float to the surface confident that it will be fully inflated on the surface so boats can see you.
Fill the 0.1L cylinder from your main tank before the dive and attach it to the SMBCi before you jump in. When you’re ready to deploy your dSMB attach it to your reel, unfurl the SMB and open the cylinder valve. If you forget to fill the mini cylinder before the dive you can still inflate the dSMB through the baffle at the bottom like most dSMBs.