Bare board size: length 60*width 42*thickness 13 unit mm without thread end Input terminal: red wire positive electrode black wire negative electrode (yellow wire is PWM dimming, can be left floating when dimming function is not used)Output: white wire connects to the positive pole of the lamp and black wire connects to the negative pole. Input voltage 10V-30V (applicable to all 12V/24/ models)Output voltage <10VOutput current: constant value, suitable for LEDs with LED vF value less than 10V, lamp bead vF value greater than 10V (such as XHP50 XHP70 12V version lamp beads), please contact the seller to modify the output voltage. The delivery default is to drive a bare board with output <10V.Buyers' attention: If you can buy bare boards, you must pay attention to the insulation and isolation treatment. The circuit board will have a temperature rise when it is working. It should be installed away from flammable and explosive materials. Although the wiring is simple, if there is no electrician foundation, please find an electrician master to install or contact the shopkeeper for guidance. Do not modify the circuit without authorization. hint:When XHP70 6V version is turned on to 4.8A current, VF (forward voltage) is about 6.88V-7.02V When 12V version is turned on to 2.4A current, VF (forward voltage) is about 12.9V-13.02V. When purchasing XHP series lamp beads , 12V car should choose 6V version 24V or more car should choose 12V version. If the 12V version of XHP series lamp beads are used in 12V car, the current will be limited due to the low voltage, resulting in no light brightness. The obvious phenomenon is that when the voltage is slightly lower, the brightness will darken. These data are measured by me, there may be errors, just for buyers to make a reference. It cannot be based on any basis.