With the battery-powered Libratone Zipp you can take wireless high-end audio to the outside world, eliminating the need to be close to an electrical outlet.
A full charge provides up to 8 hours of playtime wired and up to 4 hours using the wireless AirPlay or PlayDirect connection.
Your Zipp uses the following signals to show battery status:
GREEN solid: Battery fully charged.
GREEN pulse: On AC power and battery charging.
RED solid: Battery power low - less than 10 % left.
RED pulse: Battery power very low - Zipp shutdown is imminent.
YELLOW solid: Insufficient battery level - charging needed.
The Libratone app (available here) will also show battery status and remaining battery time when connected to the speaker.