You can leave it plugged in without worrying about it: charging, regular voltage monitoring, and maintenance.

• Automatic maintenance of the charge level for 6V/12V batteries without the risk of overcharging
• Ideal for maintaining and preventing potential battery failure on vehicles parked for extended periods or in cold weather
• Usable for stored batteries
• Automatic shutdown of the charging process in case of failure
• For all types of lead batteries: 6V/12V (WET, MF, AGM, and GEL)
  
• Charging voltage: 6V/12V
• Input voltage: 100-240V AC
• Charging current: 1000mA
• Protection rating: IP65
• Included: Crocodile clips and permanent socket with fuse
• Plug'n'Play system