only works with an optional lcd screen Controllers compatiblelcdsspecially developed by Power E-bikeRated Voltage: 36~60V Phase degree: 120° FUNCTION: 1:1 power-assisted, E-ABS brake, Cruising function, Energy feedback. Over-voltage and short-circuit protection Under-voltage protection Limited Current: 35A Mosfets: 12 x 3208 real voltage 32~75.6V Limited Current: 22A Mosfets: 09 x 3208 real voltage 32~75.6V Limitd Current: 17A Mosfets: 06 x 3208true voltage 32~75.6VThe same controller compatible with several voltages:36V , 48V and 60V!*find more information onour blog