Features Silicone Buttons: The buttons of this battery voltage current meter are made of silicone material, which adds a comfortable touch to the fluidity and responsiveness of the operation. 1.8 Inch HD Colour LCD Screen: This battery voltage current meter features a 1.8 inch HD colour LCD screen with an optimised and upgraded interface with larger and clearer text. Mobile Phone Bluetooth Monitoring: This battery monitor uses mobile phone bluetooth monitoring, no barrier maximum 10m bluetooth communication distance, according to the instruction manual to download and install the APP, after connecting through the self bluetooth, you can view all the relevant data on the APP and you can set up all the functions through the mobile phone APP. Multifunctional: This bluetooth battery monitor is multifunctional, with power, voltage, current, remaining capacity, charging and discharging, estimated charging and discharging time, and percentage of capacity, which can be seen at a glance through the clear display. Wide Application: This smart battery monitor is widely used for 10‑100V, 0‑400A acid, lithium ion, NiMH batteries and other batteries, which are widely used for battery monitoring in RVs, automobiles, electric motorbikes, carts, boats and so on. Spec: Item Type: Battery Monitor Material: ABS, Stainless Steel, Silicone Screen Size: 1.8 Inch Sampling Method: Shunt Current Measurement Range: 0-400A Current Resolution: 0.01A Capacity Display Range: 0%-100% Power Measurement Range: 0-40KW Power Resolution: 0.01W Ampere-Hour Measurement Range: 0-9999AH Capacity Resolution: 0.1AH Bluetooth Communication Distance: Up to 10 Meters Unimpeded Current Accuracy: ±1%+0.1A Screen Power Consumption: 0.75W Screen Off Time: 20 Seconds After Charging, On When I≥15ma, Off When I20s How to Use: According to the manual to introduce the usage. Package List: 1 x Display 1 x Sampler 1 x 300cm Communication Cable 1 x 100cm Positive Pole Wire 1 x Embedded Metal Bracket 1 x Manual Package List 1 x Display 1 x Sampler 1 x 3m Communication Cable 1 x 1m Positive Pole Wire 1 x Embedded Metal Bracket 1 x Manual