Elitech GSP-6 Temperature and Humidity Data Logger Recorder 16000 Points Refrigeration Cold Chain External Temperature and humidity Sensors; Software program for Windows and Macios. Audible and visual alarm in case of over limit. Reusable data logger with big multi-function LCD display. With two models to save data :full record stop and cyclic record. Two pieces of built-in magnets are convenient to fix the data logger onto metal material surface. Record interval: 10 sec~24 hour continuously set Battery life: two years at room temperature with 15 minutes record interval and buzzer alarm disabled Power supply: single-use 3.6 V lithium battery or powered via USB. Temperature measuring range: -40 ~85 Temperature accuracy:0.5 -20 ~40 0.1 other Humidity range: 10 %~99 % Humidity accuracy: 3 % RH (25 , 20%~90% RH); 5% RHother Resolution: temperature 0.1 , humidity 0.1 % RH Ambient temperature: -30 ~70 . The battery is not rechargeable. No internal temperature and humidity sensors.