... cute robot High efficiency Diode laser source, high stabilit laser machine for welding:Features: Power of the laser can be djustable LCD touch ... Power 5W, 15W, 30W, 60W, 90W Power instability <5% Fiber Core diameter 50µm, 100µm, 200µm, 400µm ... , 600µm Fiber connectors SMA905 Minimum beam spot 50µm to 400µm ... optics 1:1 imaging optics Working distance 50mm Laser machine for welding