A wireless speaker you can leave outside

Holding a charge for 12hrs, the wireless, weather-resistant Braven BRV-1's a shock-absorbent, palm-sized, lightweight 6watt speaker that'll keep you rocking in the harshest of environments, including "rock faces... virgin powder downhills, rafting rapids", and various other scenarios during which switching the song to "Gangnam Style" could actually get you killed.