Instruct: Classify the given review into positive or negative sentiment.
Query: Be wary of battery drain

The Z22 has no way of disabling the automatic wakeup for calendar alarms. This may cause you to lose battery power much faster than you might expect. Especially if you do not constantly use the device for a few days and then expect to look up an address or phone number (think vacation).If you have appointments, the Z22 will turn on automatically to give you an alarm, and then repeat the process a number of times for each appointment even if you have the alarm sound turned off. This will drain your battery quickly when you think you have not been using the PDA. You can lower the time period before the automatic shutdown and reduce the number of alarm repeats, but you cannot make the display stay off and preserve your battery.