Feature: This is a fully automatic battery charger with 7 charging stages. Automatic charging prevents battery overcharging. So you can leave the charger connected to the battery indefinitely. Repair function: This lithium car battery charger can also help repair dead and sulfated batteries. Intelligent digital display: Can display charging voltage, charging current, battery power and temperature. Switch mode technology: Yes Polarity protection: Yes Output short circuit protection: Yes No-battery connection protection: Yes Overvoltage protection: Yes Overheat protection: Yes Compatible battery types: Lithium battery Most types of lead-acid batteries, including calcium, GEL and AGM batteries, wet batteries, EFB batteries, etc. Package Included: 1 x Smart Car Battery Charger 1 x Charger Instruction Manual Kindly Tips: Fitment: 12V/24V universal. Battery connection: red clip to battery positive terminal (+), black clip (-). Turn off the power before connecting or disconnecting the