In all honesty thats just there way of having a reply to people calling and complaining all the time. My stuff isn't working again and I paid for it. They can simply say its because the device is in the wrong position blahh blahh and avoid the truth of your device is under engineerd and or we used cheep hardware to build ours. But if you actuly look at radio frequency transmition this isn't the case and clearly points to device under engineering.
The wireless communication standard 802.15.4 was established by the Institute for Electrical and Electronics Engineers (IEEE). A few examples of wireless IEEE standards include the 802.11 standard which defines communication for wireless local area networks (LANs) and 802.16 that is used for broadband wireless communication in metropolitan area networks.
While both 802.11 and 802.16 standards are concerned with higher bandwidth Internet access applications, 802.15.4 "blue tooth" was developed with a lower data rate, simple connectivity and battery applications in mind. The 802.15.4 standard specifies that communication can occur in the 868 MHz to 868.8 MHz, the 902 MHz to 928 MHz or the 2.400 GHz to 2.4835 GHz industrial scientific and medical (ISM) bands. The 868 MHz and the 902 MHz bands offer the least amount of bandwidth under the specification with 20 kHz and 40 kHz available for each band, respectively.
So lets apply our frequency radio transmissions found in 802.15 to our signal graph.
Now we clearly found ourselves staring at frequency wave length graphs. Paired with the above knowledge we now know and understand under what density and distance our signal travels out. The greater our frequency rises the more distance achieve by tightening our wave length. But the denser our objects become the less cable the signal is to penetrate the device. By lowering the signal we broaden our wavelength making our distance drop while allowing our data signal to pass denser objects such as wood and dry wall but suffering data transfer rate. The distance supplied in our data sheet and density of the wave clearly dictates a clothing pocket or the inside of your leg to your shoulder traps location becoming a moot and arguless point.