1. Ultra-low power consumption screen, one button battery can last up to 8 months on standby, and the battery can be replaced; 2. Built-in + high-performance water-absorbent particles, water can be added; 3. Ultra-clear widescreen display 4. Can be adsorbed anywhere on the guitar panel Specification: Screen size: 2.8 x 2.8cm Test temperature range: -20-70 Humidity range: 10%-99%RH; Button battery model: CR1130 Material: ABS colour: blue Package Contents: 1 x guitar humidifier 1 x 10ml water injector 2 x magnet sheet Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.