Check the listing for details. 15W stereo PLL FM transmitter broadcast Wireless audio broadcasting Christmas. Condition: New. Listed at 75.50 USD. The package does not include the antenna and power cord power supply:https://www.ebay.com/itm/125605507996 (In California, USA)Antenna: https://www.ebay.com/itm/114310270527 (In California, USA ) 15W KIT : https://www.ebay.com/itm/114316748312(In California, USA )It has two powers,1.5W and 15W,You can easily switch between them according to the instructions on the package product description:Power input interface DC2.1Freq range :87MHz~108MHzPower : 1.5w or 15w Tuning Step : 100khzantenna type output:TNC/BNC(Includes a TNC K TO BNC K conversion header)Channel: stereo overall dimensions: 180*125*48MMRF output impedance:50 ΩPower supply in: DC12V6AStabilized way:PLLReference range:2--12K (This is not absolute, empty ground, the antenna is installed in the high place, the effect will be better)Audio input interface: 3.5mm headphone connector and Lotus interface weight :0.65KG (Including packaging materials) Package Include: 1 X ST-15B V2 FM transmitter 1XTNC K TO BNC K conversion headerNote: ,Do not including power supply and GP antenna.