0Sendo
M550
Announced
2003
Weight
77 grams
Features
The M550 was the first phone developed by Sendo’s newly formed Singapore development team. The M550 was also Sendo’s first clamshell phone. It was very small and light at 68 cc’s and 77 grams and offered the user dual displays a 4096 colour inner display with 128 X 128 pixels and a 96 X 64 outer display that was monochromatic inverse with a black background and lighter graphics. It was offered in two versions a 900/1800 MHz version for European markets and an 850/1900 MHz version for the Americas. The dual display was co-developed with Samsung and was very advanced at the time being very thin and offering excellent contrast and performance. Similar to other phones in the Sendo range it offered downloadable wallpapers games and ringtones and had a polyphonic processor from Yamaha to enable 16-bit audio. The M550 was widely adopted by network operators worldwide and sold in high volumes. The radio section of the M550 was very advanced at the time and utilised a nearly zero-IF architecture co-developed by Sendo and Silicon Labs that offered improved performance and battery life over competing designs.
The M550, similar to other Sendo products, was mechanically configurable with both the outer housing and the keypad being late-stage configurable allowing Sendo to offer different designs to different customers and also the benefit of rapid order fulfilment of customised devices for each customer. As with other Sendo products it was marketed both branded as Sendo and also available as a co-branded device with network operators and large retailers.