Dual knob constant voltage LED dimmer with digital display. Rotate knob to change brightness and fade speed. Match with RF 2.4G single zone or multiple zone dimming remote control optional. 0-100% dimming smoothly without any ash. High load current up to 20A.<br><br>PWM frequency 250Hz, 500Hz, 1KHz, 2KHz, 4KHz, 8kHz or 16kHz selectable. Over-heat/Short circuit protection, recover automatically. Colour:Black Material:iron<br><br>Package Contents: 1 * Dual Knob Constant Voltage LED Dmmer<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.