It can be used for automaticly selling system-it can be used for 6 different kinds of coins (1, 5, 10). According to the material and diameter of coins, it is very accurate to identify true coins. You can freely set the required currency, do not need to compare the sample money, CPU automatically memorize the set of coins. Support coins with only one signal output. WIDE APPLICATION: Can be applied in game machines, vending machines, coin-operated telephone, coin-operated washing machines, coin-operated toy cars, massage chairs, etc. Power source: DC12V Applying coin diameter: 15mm-29mm Applying coin thickness: 1.8mm-3.0mm Operating temperature: -10-60℃ 4pin socket Colour: silver + black Material: plastic + metal Package Contents: 4 * Coin acceptor 4 * Connecting line 4 set * Mounting screws (The appearance of screws with different batches) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.