... offer a convenient and profitable solution for locations where GSM wireless connection is more accessible than PSTN, e.g. rural area, ... -in Rechargeable Batteries1200 mAH / 7.2 VCompatible Smart CardEurochip I, Eurochip II, T2G, T2G+Lightning Surge ProtectionNot less than ... VSound Level of RingCompatible Smart Card>= 70 dB(A)Eurochip I, Eurochip II, T2G, T2G+StructuralHousing MaterialPowder coated die- ...