The stylish ayrton senna signature collection pebble smartstick emergency portable battery pack charger for mobile devices has been enhanced with an increased 3000 mah power supply ergonomic re design with protective port dust cap and handy clip on karabiner also includes limited edition signature ayrton senna collectors badge charge your portable device on the move without the need for mains power small and light enough to carry around in your bag or clip on your rucksack the ayrton