you can install the type of bulb you like according to the needs of the ambient atmosphere. There is a twist switch on the lamp socket,you can use it to turn ON/OFF the light. Turn off the power, insert the product to the track, install the bulb, turn on the power supply and enjoy the light. Bulbs Not Included You can install the type of bulb you like according to the needs of the ambient atmosphere. Compatible with H type 3-wire-1 circuit track system and Halo light circuit. Please make sure that the grounded contact is properly connected to the track.(The top contact) Any cooperation or bulk order are welcomed. There is a rotary switch button on the lamp socket,you can use it to turn ON/OFF the light. STGLIGHTING H-type 3 Wire Track Light Pendants Length 4.9 Feet Restaurant Chandelier Decorative Chandelier Instant Pendant Light Bulb Not Include Glass Pendant Lamp Item 10467 Buy JIKUETWGTG Track Pendants Lighting Iron Art Iron Warm Green Decoratefor Instant Pendant Light for Cabinet Show Window Customizable Track Lighting Loft Stytle E26 Warm... 750 GPH / 2839 LPH Automatic Bilge Pump 12v, 3/4" (19mm) Interior Diameter Hose, 41" 18-Gauge Wire - FO3760. Sale price$41.50. Sold out Wayfair Led Track Lights FSLiving H Track Pendants Lighting Iron Art Iron Macaron Blue Decoratefor Instant Pendant Light Cabinet Kitchen Island Customizable Bulbs Not Included 1 L Wayfair Track Light Pendants Specifications: Lamp size:φ10.43″/26.5cm, height:7.87″/20cm The whole wire length is 3.9ft(120cm) Track connector type: H-type (3 point contact system)Bulb Type: E26, 60W MAX . The twist ON/OFF switch on the socket is easily to control the light and meet your DIY idea(keep one light ON or 2 light ON). Providing customized service: FREE customized wire length is within 4.9 feet, optional track adapter type (Halo, Juno, L type), if you need, please contact me. All customization requirements can be modified before shipment. Whether you are installing an Halo Type,Juno Type or L-Type track, you can find the track adapter you want here because we provide customized services for the track adapter. Bulb Type: E26, 60W MAX. Bulb Not Included.