There are 5 units in the GF-87 series family: GF-8701, GF-8702, GF-8703, GF-8704, and GF-8705, all of which are capable of receiving GPS and GLONASS signal. While receiving GPS signal, the power consumption during tracking is -161 dBm, and during acquisition it is -147 dBm. However, while receiving GLONASS signal, the power consumption during tracking is -157 dBm, and during acquisition it is -143 dBm.