Features 1Compact light and portable. Can be hung on children's clothes strollers schoolbags beds and desks bringing great convenience for travel. 2There is no need to charge just place them in the face of the sun turn on and they repel annoying mosquitoes and insects. 3Solar energy mosquito repellent nontoxic nonradiation safe and efficient compass design can help you determine outdoor direction suitable for children camping outdoor workers night workers gardeners farmers fishermen travel and other outdoor activities. 4Using solar power compasses help people (or students) navigate outdoors. A hook can easily catch any object. 5Prevent you and your family from being bitten by mosquitoes and to create more fun and safety for your outdoor activities. Specification Item Type: Mosquito RepellentMaterial: ABSSize: Approx. 8.9 x 6.8 x 1.5cm / 3.5 x 2.7 x 0.6inBattery Type: Lithium batteryBattery Model: Lithium battery x 1 300mAh (built-in)Sound Frequency: 5000-9000HzWorking Power: 0.01WWorking Area: 5Charging Mode: Place the device in direct sunlight Package List 1 x Mosquito Repellent1 x Manual Note Because different species of mosquitoes sense sound waves at different frequencies sound waves are effective for most mosquitoes but may not be effective for some.