Senders Mini Portable Wireless Bluetooth Speakers, TF Super Bass Speaker for Outdoor Hiking, Cycling and Running (Green) Compact Design and Water Resistant: Definitely small enough, extremely portable Pair in a few seconds with your iPhone IOS and Android Smartphone, tablet or music player High Compatibility Multi-play Function: Adopted the newest Bluetooth 4.0 Technology strenghten the signal 2 times and guarantee the high fidelity sound Built in Microphone, hands free calling and voice broadcast