The leagend BM2 is an entry-level Bluetooth monitor for 12V batteries, showing state of charge and voltage in real time with historical voltage graphs in the app. It automatically tests the cranking system when the engine starts and runs charging system tests manually from the app, storing up to 35 days of history with the start, stop and driving time of each trip. The app is free with firmware upgrade support, and the housing and cable are flame-retardant and high-temperature resistant.
BATTERY MONITORING
● Real-time display of battery power and voltage;
● View historical voltage graphs through the mobile app;

STARTING AND CHARGING SYSTEM TEST
● Automatically test the cranking system when the engine starts;
● Manually test the charging system through the app;
RECORD AND STORE DATA
● Store up to 35 days of historical data in the device;
● Record the starting time, stopping time and driving time of each trip;
FREE APP
● Free app download;
● Firmware upgrade is supported when a new version is available;
REMINDER
● Low battery reminder;
● Abnormal cranking and charging system notifications;
SAFER DESIGN
● Built-in short-circuit protection and reverse connection protection;
● Flame-retardant and high-temperature-resistant cable and housing;
SPECIFICATIONS
Inquiry & Sample Request
Faqs
2. We respect our customers and are fully willing to grow together with them to achieve a win-win situation.
2.Small-batch trial orders are supported.
1. The customer provides the required drawings/detailed parameters.
2. The project is confirmed to be feasible.
3. A contract is signed with the customer and a deposit is paid.
4. Follow up on the customer's needs and make samples.
5. The customer tests and confirms the samples.
6. Mass production begins.
2.During the warranty period, we provide free repair and free firmware software updates.
2.If the defective rate exceeds the acceptable range based on the sampling inspection ratio, the factory shall re-produce the goods.
2.On-site factory visits require an appointment 7 working days in advance. We will arrange a dedicated person to receive you and provide a full tour of the production workshop, quality inspection process, warehousing and logistics. Video factory visits can be booked at any time and support bilingual explanations in Chinese and English.
2.Standard quotes are valid for 30 days, while quotes for customized products are valid for 15 days.