Check the listing for details. Upgrade Red M L XL Servo Motor Technic Power Functions 7.4V Enhanced Version. Color: Red, Condition: New. Listed at 10.99 USD. They are compatible with Legoes power group MOC PF blocks, such as tech-nic train. Type: Enhanced M Motor for Legoeds Technic-Power Fuctions No-load voltage: 7.4V Blocking current: 1.85mA No-load current: 160mA Rotating speed: 620RPM Noise: 85 Torque: 3.4KG Size : 55*25*25mm Type: Enhanced L Motor for Legoeds Technic-Power Fuctions No-load voltage: 7.4V Blocking current: 2.1mA No-load current: 140mA Rotating speed: 520RPM Noise: 83 Torque: 4.4KG Size: 55*30*25mm Type: Enhanced XL Motor for Legoeds Technic-Power Fuctions No-load voltage: 7.4V Blocking current: 1.9mA No-load current: 130mA Rotating speed: 250RPM Noise: 80 Torque: 6.3KG Size : 55*40*40mm Type: Enhanced Servo Motor for Legoeds Technic-Power Fuctions No-load voltage: 7.4V Torque: 2.2KG Size : 55*40*25mm.