Chill Box Bluetooth 4.0 Speaker Chill Box Audio Speaker - available in multi colors - rugged brushed aluminum case Rechargeable and Reliable Lithium Ion Battery Great for camping, backpacking, day hikes, home, backyard, parties, Dorm, and even picnics Smartphone integration - Check the battery level of your speaker directly from your Smartphone (iPhone or Android 4.0 or higher) with the built in battery-level icon. Advanced Bluetooth 4.0 technology brings outstandingly rich sound and clarity while the design is refreshingly modern with a mix of materials and textures that compliment any personal style