HP iPAQ H4155
The HP iPAQ H4155 has an Intel XScale PXA255 processor running at 400 MHz. This is the current top of the line processor, also used in the iPAQ 2215 and 5555, and the HP iPAQ H4155 benchmarks similarly to those units. The HP iPAQ H4155 PDA has 64 megs of RAM, 55 of which are accessible to the user, and 32 megs of NAND flash ROM, 2.85 megs of which are available as a non-volatile File Store. HP has shipped the HP iPAQ H4155 with a utility that can format the File Store area should it become corrupt or should you wish to erase its contents before selling it or giving it to someone (being non-volatile, the File Store will not be erased even after a hard reset). This is a very important feature of the outstanding HP iPAQ H4155 PDA.

Video playback was excellent using Pocket MVP and Pocket TV Enterprise. In fact, the HP iPAQ H4155 handheld PDA outperformed many other competing PDAs dropping many fewer frames for videos encoded at high rates. You have to see it for yourself to truly understand what a marvel this little beauty is… everything you can hope for in a PDA.
Trans-flective displays, currently one of the best LCD display technologies have become standard on PDAs, if not most all recent PDAs, and the HP iPAQ H4155 has a 3.5" transflective display. HP makes some of the nicest, and they're always bright, color saturated and contrasted. The HP iPAQ H4155 is no exception, having a lovely display, but if you hold the unit at an angle rather than holding it straight on, you will notice a yellow color cast.

HP iPAQ H4155 battery is Lithium Ion Polymer rechargeable. Battery is user replaceable. 1000 mA and 1800 mA extended battery available for purchase. You shall not run out of battery again.
Like all PDAs, the Cheap HP iPAQ H4155 PDA has a voice recorder, and the unit includes an Audio control panel applet that allows you to adjust the microphone EQ for "Short Range Recording", "Normal" and "Conference Recording". You can also enable AGC (automatic gain control), and set the headphone volume independent of the speaker volume.
The HP iPAQ H4155 PDA has built-in WiFi 802.11b wireless Ethernet networking. The HP iPAQ PDA H4155 aluminum cases truly have excellent range considering that it doesn't have an external antenna. In fact it rivaled the iPAQ 5555 which also has excellent range.