Host system: 1) Voltage: 9 - 15V 2) Operating temperature: -20~ 85°C 3) Alarm mode: voice/2KHz/4KHz 4) Display: temperature / pressure information 5) Display style: LCD digital and pattern 6) Wireless modulating style: GFSK 7) Receiving frequency: 868.4MHz 8) Receiving sensitivity: -100dBm 9) Emission frequency:868.4MHz Extension system: 1) Life cycle: 5-7 years (5hrs/day) 2) Operating temperature: -30 ~ 120°C 3) Emission frequency: 868.4MHz 4) Operating condition humidity:<95% 5) Emission power:<-2dBm 6) Wireless modulating style: GFSK 7) Data transmission rate:100Kbps 8) Address code length:32bit 9) Data transmission cycle:3-30sec 10) Pressure detection: 0-100psi