How does the lcd display connect to the d250sa? is it via cable or bluetooth? thanks

It is a device which works without the d250sa and has no connection to it. It is manufactured for CTEK by NASAMARINE (BM1 Compact). You connect it to the service battery and you can use it without the D250SA.

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Description

⚡ Power up smarter, last longer — the charger that works as hard as you do!

COMPACT LIGHTWEIGHT - Sleek 1.8 kg form factor fits seamlessly onboard without bulk.
RUGGED IP 65 PROTECTION - Splash-proof and dust-tight design built for the toughest environments.
SMART TEMPERATURE SENSOR - Adaptive charging that thrives even in freezing conditions—never miss a charge.
MAXIMIZED 140 A CHARGING POWER - Unleash rapid, efficient energy flow to extend battery life and reliability.
PRECISION AGM VOLTAGE CONTROL - Switch effortlessly between 14.4V and 14.7V for peak battery performance.

The CTEK 40-256 On-board Charger and Display is a high-performance 140A battery management system featuring adjustable AGM voltage modes (14.4V or 14.7V), a temperature sensor for optimized cold-weather charging, and an IP65-rated splash and dust-proof casing. Compact and lightweight at 1.8 kg, it delivers reliable, efficient charging tailored for professional-grade battery maintenance in demanding environments.

Specifications

ASIN	B07D7LTLZR
Best Sellers Rank	1,016,660 in Automotive ( See Top 100 in Automotive ) 2,599 in Car Battery Charging Units
Box Contents	On-board charger; spared display; user guide
Brand Name	CTEK
Colour	black
Country of Origin	China
Current Rating	20 Amps
Customer Reviews	3.5 3.5 out of 5 stars (13)
Global Trade Identification Number	07340103402565
Input Voltage	14 Volts
Item Type Name	20A off-grid charging system: on-board charger and display for charging the additional battery while driving
Item Weight	1.8 Kilograms
Manufacturer	CTEK
Manufacturer Part Number	40-256
Model Number	40-256
Output Voltage	12 Volts
Product Warranty	2 Year

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CTEK 40-256 On-board Charger and Display

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