The Stanley 77-176 DWM30 digital measuring wheel allows for Bi-directional measurement (measures in either direction) and automatic conversion of units of measurement. It can store up to 8 measurements in memory, auto power off after 2 minutes of suspended use as well as a manual power off. It has a heavy-duty, metal folding handle and rubber grip, folding wheel mount, die cast aluminium wheel, wear resistant rubber tread and a folding kick stand. 1-77-176 CONSISTS OF: Measuring Wheel, Manual and Carry Bag Technical Specification: Working Range - 9999.99 Metres or 9999.99 Feet . Wheel Diameter - 254mm Working Environment - Built for exterior use Working Accuracy - ± 1% Typically Units of Measurement - Metres, Centimetres, Feet & Inches Wheel Mount - Folding Wheel mount included Batteries - 3 x AAA Batteries Battery Life - Up to 50 hours of intermittent use Build Standard - Rugged construction for outside use Warranty - 12 Months