The RC-S2LP-915 module is based on STMicroelectronics S2-LP transceiver. This device is a high performance ultra low power RF transceiver designed for RF wireless application in the sub 1GHz band. Operative Frequency bands : 915MHz. The module is designed for maximum performance in a minimal space, with 4 programmable I/O pins. RC-S2LP-915-HA -> Helical Antenna Version