The HRUSB-MaxSonar-EZ1 is a great choice for use where sensitivity is needed along with side object rejection. The HRUSB-MaxSonar-EZ1 is a good, low-cost starting place for a customer not sure of which HRUSB-MaxSonar-EZ sensor to use.
The MaxBotix high resolution MB1423 HRUSB-MaxSonar-EZ2 is a good compromise between sensitivity and side object rejection.
The MaxBotix high resolution MB1443 HRUSB-MaxSonar-EZ4 has a narrow beam and is an excellent choice when only larger objects need to be detected.
These are 4" in diameter omni-wheels with a shaft, collars and a bearing.
Etrovision's N70Q-10 is an HD 10x Zoom IP Camera. It can provide HD-1080p internet video using H.264 or MPEG4 using TCP/IP or UDP. It also features motion detection, timers and automatic file uploads via FTP and e-mail.