The Portable Palm Phone Jammer is pretty self-explanatory – it boasts a blocking distance of 5 to 10 meters, preventing frequencies in the GSM 850/900/1800/1900MHz range. Great if you want to keep a small room free from the interruptions of incoming calls, especially when you’re embroiled in an important corporate meeting. The Portable Palm Phone Jammer measures an extremely pocket-friendly 6cm x 6.8cm x 2cm and weighs 70 grams. Needless to say, you have to learn to use this with discretion and not abuse it. This device can be picked up for $166 – pretty steep if you ask me considering the CX 200 Director II that was released last year and retailed for less than half that amount.