... up to 10Hz/second.4. Big spot size with even energy distribution.Handles with changeable filters (30*12mm2,40*13mm2,50*15mm2) ... Handles with fixed sapphire (8*40mm2,14*40mm2,14*50mm2 ... Cooling,Semi-conduct cooling,Air cooling,Advanced Water CoolingHandpiece1. Changeable Filter Handpiece(Spot Size: 30*12mm2,40*13mm2,50* ...