Kit includes: (1) Navitas 600-Amp Controller, Plug and Play 16-Pin harness and MODZ Heavy Duty Solenoid with Diode for Club Car DS or Precedent with Curtis OEM 1510/1515 Controller Golf Carts Performance: Cost effective replacement to increase power of your golf cart. Speeds up to 23MPH with stock 18" wheels and tires. Improved efficiency at lower speeds = More Range Bluetooth App: The Navitas app allows you to monitor the vehicles performance. Built in speedometer. Gear indicator (Forward, Reverse, Neutral). One-click Car lockout feature. Live battery voltage monitoring. Provides alerts that you can send directly to us or technician/dealer for diagnostics. Features: Compact size and extremely lightweight. Cost effective replacement to increase the speed and power of your golf cart. Motor over-speed protection is ensured using the motor field. MODZ Heavy Duty Solenoid and Diode Included: The solenoid is responsible for managing high amperage loads between your golf cart controller and batteries. A heavy duty solenoid is required when upgrading to high amperage controller. Navitas 600-Amp Club Car DS or Precedent with Curtis OEM 1510/1515 Golf Cart Controller Kit and MODZ Heavy Duty Solenoid with Diode