GSM prepaid model,universal frequency,DIY,easy to install, work with all sensor or sirens,High quality and reliable, OEM or logo ... you desire to connection of a local computer. Adopting wireless GSM network with advanced digital technology, widely to protect for ... receiving distance 160~200m (outdoor), indoor: 30~80m(indoor)4. GSM Band: GSM 900/1800MHz (850MHz/1900MHz optional) power: 1W 5. Hardwired ...