5704 - Coinmech (front type), electronic 1) Remove the factory installed plastic token from the coin sampling clamp. 2) Slide the coin clamp backward & insert a correct coin into the clampslot then pinch the coin. 3) Adjust the insert slot opening size by loosening the screw in the back side of front panel to fit your coin's diameter if necessary. That prevents bigger invalid coins from being inserted. 4) Select the right mode between normally open and normally close (the most standard used is NO - Normally open). Choose the right speed of coin acceptance among 100ms(slow speed /long pulse) and 50ms(medium speed /medium pulse) and 30ms(fast speed/short pulse) by TIMER SWITCH for synchronizing with your software/game. 5) VR tunning for sensitivity of coin acceptance turn clockwise(+) for slack coin selection and anti-clockwise(-) for strick coin selection against slugs. Specifications: Voltage: DC+12V Coin diameter: 18mm-31mm (1.2mm-2.4mm thickness)