Quanzhou Tesunho Electronics Co., Ltd.

Model Number: TH-289 Brand Name: TESUNHO Key Specifications/Special Features: Place of origin: Fujian, China (Mainland)Brand name: TESUNHOModel number: TH-289Type: HandheldDimensions: 100*58*32mmFrequency range: HSDPA/WCDMA:2100/1900/850(900)MHZ Storage Channel: 56Talk range: Unlimited(Global)UMTS band: HSDPA/WCDMA:2100/1900/850(900)MHZSIM card: GSMAdvantages: GPS Satellite Plsi, Flashight, TOTFeature: Selective Calls, Group Calls and All Calls (U)SIM/SIMU: Standard SIM card, interface 3V SIM card, and 1.8V SIM cardMax power consumption: About 2.2W Input intelligent charger: 12V/24V
Operating voltage: DC3.3V-4.2V(3.8V is recommended)
Operating temperature: -30*C to +75*C
Weight: About 194g
Packaging details: Standard package
Delivery detail: Shipped in 3 days after payment

How it to works
First,GSM 3Gradioworks with GSM850/1900/UTMS2100MHz or GSM900/1800/UTMS2100MHZ (depend on your country). You need to buy a SIM card to insert into the radio and it can talk, cover the whole world.
Second, GSM 3G walkie talkiecost data flow, normally it is 2.88M per hour for unstopping communication, and it is 0.06M on the standby mode per day.
TH-289 can be made withGPSfunction.
Third, there will be amanagement websitefor you to assign users' account and set talking rights or function. It helps institution with many people to save time and cost on communication.