The only other button on the SP200 is an on/off switch nestled on the right hand side of the speaker phone that can be used to completely power it down, although it's worth bearing in mind that the speakerphone will automatically turn itself off if it's left idle for 15 minutes (a quick tap of the call answer buttons starts it up again). Measuring 12.4 x 5.6 x 2.4cm the device is slightly longer and thicker than its predecessor, but not by much.
Pairing the speakerphone with your handset is very straight forward as it automatically enters pairing mode the first time it is switched on. This means that to get both devices talking to each other it's simply a case of starting a pairing search on your mobile and entering the standard ‘0000' Bluetooth passcode. If you need to pair the speakerphone with another mobile at a later date you can force it into pairing mode again by simply holding down the call/answer button for around five seconds until the LED at the top of the device starts to flash blue.
The speakerphone supports Bluetooth 2.0 and all the main call handling functions are controlled via the single call/answer button. To answer a call or end a call you tap the button once, to reject a call you press and hold it for two seconds and to redial the last called number you tap it twice in quick succession. You can also activate voice dialling by pressing the button for two seconds from idle and you can mute and unmute the speakerphone by holding the button for two seconds during a call.
The speakerphone has built-in echo cancelation which you would expect, but it also has onboard noise reduction. This works rather well with callers reporting that it cut out a lot of background engine and road noise. They said that although it still sounded like we were using a speakerphone, apart from the odd bit of clipped speech from over eager noise reduction, the voice quality was very clear and distinct.