Trumpet silencer?

I am an aspiring trumpeteer, and am starting to struggle with finding time during the day to practice. To fix the problem, I was planning to buy an electronic mute for my trumpet.

Do these mutes actually silence the trumpet, or at least to some extent?

I'm talking about the electronic kind, with earphones...

Yamaha make a mute called "silent brass". You hook it up to a little amp and ear buds so you can hear yourself perfectly, whereas those around you barely hear anything.

Because you can hear yourself, you don't overblow.

Trumpet mutes do exactly that, mute the sound, they don't entirely silence the sound.

Silent Brass is definitely the way to go, I love mine. It also has an auxiliary jack to hook-up and Mp3 player or Metronome or computer, makes playing parts of songs much easier.