Main battery: built in rechargeable Li-Po battery pack, (3.7V, 420mAh) and charging via USB port.
Wireless communication 2.4GHz Bluetooth class II or class I (optional).
Keys: 2 keys, 1 for scan 1 for clear data.
LED indicator: 3 LEDs, 1 LED 2 colors (green and orange) for good read or memory full, 1 LED (red) for low battery, 1 LED (blue) for wireless communication on-line status.
Beep indicator: buzzer can be disable or enable by program.