Check the listing for details. HOBO by Onset H21-002 Micro Station Data Logger ~ ONSET COMPUTER ~NOS. Condition: New. Listed at 59.49 USD. HOBO by Onset H21-002 Micro Station Data Logger ~ ONSET COMPUTER New old stock. Surplus from a local institution.Includes batteries, but I cannot guarantee if they are good.No other accessories included. A popular rugged compact size data logger that has over 500k of nonvolatile flash data storage and accepts up to four plug-and-play smart sensors. This data logger monitors outdoor weather conditions with the HOBO Micro station and operates in indoor and outdoor environments. Onset HOBO Data Loggers H21-002 Specifications Operating range -20° to 50°C (-4° to 122°F) with alkaline batteries, -40° to 70°C (-40° to 158°F) with lithium batteries Sensor inputs Up to four smart sensors (including multiple-parameter sensors) Communication 3.5 mm serial port Dimensions 8.9 cm H x 11.4 cm D x 5.4 cm W (3.5 x 4.5 x 2.125 inches) Weight 0.36 kg (0.8 lb) Memory 512K nonvolatile flash data storage Memory 512K nonvolatile flash data storage Battery life 1 year typical use (up to 4 sensors with 1 minute or longer logging interval) Battery type Four standard AA alkaline batteries included (for operating conditions -20° to 50°C [-4° to 122°F]); optional AA lithium batteries available for operating conditions of -40° to 70°C (-40° to 158°F) Time Accuracy 0-2 seconds for the first data point and ±5 seconds per week at 25°C (77°F) Data Type Supports measurement averaging based on availability Logging Start Modes Immediate, push-button, or delayed start options Mounting Mount vertically on flat surface 18 cm or wider, optional mast mounting kit for use on 4.1 cm diameter masts Sensor network cable length 100 m (328 ft) maximum