Audio and Battery
Audio features on the Bosch 909 Dual S are quite minimal, offering only monophonic ringtones with no loudspeaker or 3.5 mm audio jack for headphone connectivity, indicating its basic auditory functions. The phone is powered by a removable Li-Ion battery, which attempts to balance the phone's lightweight chassis with a reasonable battery life. It offers up to 180 hours of standby and 5 hours of talk time. Given the demands of devices at the time, this was generally sufficient for day-to-day mobile communication needs.