Ikea Sunnan LED Solar Desk Lamp - Green No costs for electricity; the solar panel converts sunlight to energy! (3) AA1.2V HR6 rechargeable batteries (included). Fully charged batteries will provide light for approximately 3 hours of use. The batteries can be replaced and will last for approximately 2 years. Built-in LED bulb (lasts 10 times longer than an incandescent bulb, approximately 20,000 hours life span) with warm white light (2700 Kelvin). Designed for indoor use (recharge outdoors in sunlight, not waterproof) but great to take out to the deck or patio at night or to use where you do not have access to electricity. No plugs or cables, easy to move to charge outdoors. Great for Camping, packs flat.