900 Mhz is the correct frequency for a baby monitor, but this model uses analog technology with no privacy guards. (Ten channels doesn't mean you have privacy) Here is what you should be looking for in a baby monitor in a modern home:

900 Mhz Digitial Spread Spectrum (DSS) technology provides the privacy of digital and spreads the signal across multiple channels so a scanner can't put it back together for listening. There are still ways to listen in, but generally DSS is a good bet. Also, be sure to get a baby monitor that uses the 900Mhz frequency band. After all, you can't have multiple devices (wireless network, cordless phone, etc.) share the same frequencies without interfering with each other. Here are the frequencies you should be using:

Baby Monitor: 900Mhz DSS
Wireless Network: 2.4 Ghz
Cordless Phone: 5.8 Ghz DSS

This is particularly important if your neighbors live closer than 2000 feet from your house.