Motorola, high on the success of its Razr clamshell phones, unveiled several more devices last night as it kicked off its annual analyst conference in Chicago.

The popular family of thin handsets, which has now sold more than 50,000 units, has done much to power recent market share gains by the Schaumburg, Illinois, company. Motorola is now aiming for sales of 500,000 Razr devices, Chairman and Chief Executive Officer Ed Zander said in an opening speech monitored via a webcast.

The Krzr (pronounced 'craze-er') is a variation on the Razr made narrower in response to requests from youngsters, women and customers in Asian countries, said Ron Garriques, president of Motorola's mobile devices business. The phone is 1cm narrower than the Razr, according to the company. It features a glass surface on top and brushed magnesium on the bottom, and is equipped with up to 1GB of removable memory and a 2Mp camera with an 8x zoom lens.

The Krzr will come in GSM (global system for mobile communications) and CDMA (code division multiple access) versions. The CDMA phone, with high-speed EV-DO (evolution-data optimised) capability, will include a dedicated keys on the outside of the phone for controlling an integrated music player. Both versions of the Krzr are being tested now and heading for launch in the third quarter, Garriques said.

Motorola also unveiled what Garriques called its first major product with a 'slider 'form factor in which the keypad slides down from behind the display when needed. The phone, called the Rizr, features a 2Mp camera, music capability and removable memory.