Calculator Keyboard

1.Mini 5 Pin numeric keypad with 18 keys 
2.The device could be detected automatically by PC without the driver, and plug and
play
3.Build-in DC 1.5V battery.It could be used normally without changing the battery
for a long time 
4.The device applies to account by normal operations
5.In the mode ogf calculator, it would apply the normal calculator" functions. And
if you connect it by USB cable to your PC, you may send the results showed on
LCD to PC to input or edit the data
6. Press "MODE" to choose the mode for operation
7. This device will automatic turn off during 6 minutes of no movement
8. Press the key of Num lock to transform number key and direction key
9. Insulation resistance: 100M OHM at 100VDC
10. Contact bounce: 5ms max.
11. Operation voltage: +5V DC 10%
12. Operation current: 250mA max. at +5VDC