Package Included:1 x Three-phase Mutual Induction Prepayment Electric Meter 1 x Card Features:1. Energy metering function2. Monitoring function3. Battery stacking function4. Maximum load control5. Anti-theft function6. Identification function7. In-table data writeback function8. Data retention Specifications:Energy Meter- Phase: Three-phase - Rated Current: 3x1.5(6)A  Basic current: 1.5A,Maximum current: 6A- Voltage: 3x 220/380V  - Wire voltage: 380V- Voltage: 220V  50Hz- Constant Pulse: 1600imp/kWh- Material: Metal + Plastic- Accuracy: 1.0 Grade- Display: LCD Backlight Digital Display- Measuring Range: 000000.00~999999.99kWh- Pulse Width: 80±20ms- Functions: Display electricity, voltage, current, frequency Card Reader- Full speed USB communication driverless- With indicator light, non-slip base, easy to plug- Provide programming examples and demos for easy development and testing Precautions:1. Over-capacity Alarm:After 30 seconds, if user exceeded power consumption, the meter will pull the brake. After 3 minutes, the meter will automatically resume power supply. The user can restore the power supply immediately after the card is inserted. At this time, the user should reduce the load, otherwise the power will be cut off.2. Early Warning Reminds:When the remaining power is less than 2 times of the “alarm power”, the alarm indicator flashes to remind the user to purchase electricity.3. Power Failure Warning: When the remaining power is the user's agreed alarm power, the meter will be powered off.4. One Meter Has One Card:Please insert the card into the meter before purchasing electricity, in order to purchase electricity normally.5. Valid card :The purchase of the power card into the card room as required, if the card is valid, the power meter automatically reads the data into the table, please save the card carefully.