Specifications Compatibility Ulla fits on bottles of all sizes, shapes and materials Charging No Auto ON/OFF Yes Daylight sensor Yes Proximity sensor Yes Battery life 6 months Battery type CR2032 coin cell Material BPA-Free PolyPropylene Size 4 x 2.5 x 1 cm Weight 28 g Working temp. 0°C to +70°C Core Low power Microcontroller High precision 3-axis accelerometer Ambient light sensor Thermometer In the box Ulla - Hydration Reminder Silicone mounting band Battery (pre-installed) User manual