Table 2: Comparing frequencies and ranges of commercial sensor systems
PARAMETER	MPR510CA*	MPR500CA*	TPR2400CA*
Frequency	433 MHz	868/916 MHz	2400 to 2483.5 MHz
RF transmit power	–20 to +10 dBm	–20 to +5 dBm	–24 to 0 dBm
Receiver sensitivity	–101 dBm	–98 dBm	–94 dBm
Current draw	25 mA @ max power	27 mA @ max power	23 mA @ max power
Data rate	38.4 kbaud	38.4 kbaud	250 kb/s
Battery	3 V	3 V	3 V
Range	1000 ft. line of sight	500 ft. line of sight	328 ft. line of sight
The three sensors are manufactured by Crossbo Technologies, San Jose, CA.)