12V DC Voltage Only Display Range 10.0-24.0 A/F Over Lean Setting 14.8-24.0 A/F Over Rich Setting 14.6-10.0 A/F Screen Update's 2 x Second Water Proof Instrument Weighs 3 oz's Instrument dimensions 4.0"L x 1.75"H x 1.0"W Includes: Koso Instrument Bosch Wide-Band O2 sensor Weld Bung & Plug Wiring Harness Universal Mounting Bracket Instruction Manual Be sure to get an adapter fitting for 2-strokes!