variable speed switch 12 volt

{"title":"Voltage Variable Absorptive Attenuator 12 dB, DC-2.0 GHz AT-250TR","imgUrl":"https:\/\/img.chinax.com\/nimg\/5f\/cb\/2992578b9da8d7743f2447dec3a3-200x200-1.jpg","attrs":{"Price":"Negotiation","Brand Name":"MA-COM","Model Number":"AT-250TR","Minimum Order Quantity":"20pcs","Delivery Time":"1 Day","Certification":"Original Factory Pack","Place of Origin":"Original","Payment Terms":"T\/T, Western Union,PayPal","Supply Ability":"5200PCS","Packaging Details":"please contact me for details","Voltage Variable Attenuation":"12 dB","Low DC Power Consumption:":"50 \u00b5W","Single Voltage Control:":"0 to -4 Volts","Temperature Range:":": -40\u00b0C to +85\u00b0C","Plastic Package":"SOIC-8"}}