Solar Powerd Sonic Mosquito Insect Repeller with Compass--Fit for Outdoor Activities Such As Fishing, Hiking, Camping, Gardening, etc EXCELLENT BATTERY LIFEThe new and improved lithium battery allows seamless enjoyment of music for up to 4 hours on a single charge and 100 hours of stand-by, only take 1-2 hours to fully charged. Battery status displayed on IOS device.There is reminding sound when battery is low,and the led would flash in red at the same time.When taking charge, the led would would be in red, and turns in blue when fully charged.