Buttons
When holding the device facing the screen; on the top, from left to right, rocking buttons (which function as volume up/down or zoom in/out depending on the context), power on/off and camera button. Pressing the power button brings up a menu to change the profile, activate offline mode (a.k.a "Airplane or Flight mode", which turns off all emitted signals), Lock Device (either "Secure" with key code, or simple lock),[55] and an option to end the current task.
As the Nokia N900 has fewer hardware buttons, it makes use of the touchscreen to display on-screen buttons, for example, to accept, reject and end a call.
Audio and output
The N900 has a microphone and stereo speakers located on each side of the device. There is a 3.5mm four-contact TRRS connector which simultaneously provides stereo audio output and either microphone input or video output.[56] PAL and NTSC TV out is possible using a Nokia Video Connectivity Cable (usually included upon purchase).
There is a High-Speed USB 2.0 USB Micro-B connector provided for data synchronization, mass storage mode (client) and battery charging. Unlike previous versions of Nokia's Internet Tablet, the Nokia N900 lacks support for USB On-The-Go (the ability to act as a USB host) at a software level, which was a deliberate design decision to meet the device's release deadlines.[57] There is an ongoing community effort to add this support subsequently.[58]
The built-in Bluetooth v2.1 supports wireless earpieces and headphones through the HSP profile. The Nokia N900 supports hardware capable of stereo audio output with the A2DP profile. Built-in car hands-free kits are also supported with the HFP profile. File transfer is supported (FTP) along with the OPP profile for sending/receiving objects. It is possible to remote control the device with the AVRCP profile.[3] The DUN profile which permits access to the Internet from a laptop by dialing up on a mobile phone wirelessly (tethering), the HID profile which provides support for devices such as Bluetooth keyboards and PAN profile for networking using Bluetooth are unsupported but can be enabled.[59]
The Bluetooth set also functions as a FM Receiver, allowing one to listen to the FM radio. The N900 also has a 88.1–107.9 MHz FM transmitter which can, for example, play music through a separate radio. The Nokia N900 has Wi-Fi b/g connectivity with support for WEP, WPA and WPA2 (AES/TKIP) security protocols.[60]
The Nokia N900 can synchronize with Microsoft Outlook through ActiveSync and various other e-mail and calendar clients through SyncML over bluetooth or the micro-USB.[3]
The device also features a infrared port that can be used to turn the Nokia N900 into a remote controller using third-party software.[61]
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