The XBEE Module (S1 / S2) is a very popular ISM 2.4GHz product from Digi. These modules take the 802.15.4 stack (the basis for Zigbee) and wrap it into a simple-to-use serial command set.
S1 series modules work on  802.15.4 protocol & S2 series work on ZIGBEE protocol. You cannot mix S1 with S2.
XBee modules can give a communication range of 30 meters indoors or 100 meters outdoors. This module is ideal for  PC to Robot communication or  MCU to control other devices wirelessly.
This ZigBee wireless device can be directly connected to the serial port (at 3.3V level) of your microcontroller. By using a logic-level translator it can also be interfaced to 5V logic (TTL) devices having a serial interface. This module supports data rates of up to 115kbps. It has an indoor range of 30 meters and an outdoor RF line-
xbee Module price in pakistan
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