Adjustable H Type Track Heads:This light is compatible with H type 3-wire-1 circuit track system and Flexible track head rotate 330︒and 90︒ tilt to point almost anywhere exactly anywhere needed. DIMMABLE FIXTURE-Dim smoothly from 10% - 100% with a triac dimmer,700lm per LED track luminaire,4000K daylight energy efficient 7W LED track light equivalent to 50w halogen ,dimmable with most Led dimmers(Tip* Not fully compatiable with all dimmer, Please check your dimmer model in technical details if you 're using traditional NON-LED dimmers).Compatible with H type 3-wire-1 circuit track system and Halo light circuit(Track Rail and Dimmer Sold Separately). Energy Saving: 7W soft day light GU10 LED Bulb（bulb included） provides 700 lumen,it doesn't need to purchase extra bulb to replace.saving over 80% electricity bill. 50,000 hours,and help you save the cost of frequent replacement of bulbs.