Model Number: HM-621THS-#1542
Brand Name: HEIMAN
Key Specifications/Special Features:
* MCU processing* Low power consumption design, battery used for over 3 years* On-top battery compartment, easy battery replacement* Tamper resistant pins for battery* Low battery warning* Shockproof design, suitable for vehicle use* Auto check, malfunction in smoke chamber* Test and hush function* Auto reset