Sennheiser HD 450SE Instruction Manual page 8

Product overview
8 | HD 450SE
Notes on voice prompts
The headphones output voice prompts for various functions (see
examples below).
Voice prompt
"Power on"
"Power off"
"Connected"
"Lost connection"
"Pairing"
"Call rejected"
"Call ended"
"More than xx hours
playtime"
"Recharge headset"
Notes on beeps/acoustic signals
The headphones output beeps/acoustic signals for the following
functions.
Acoustic signal
2x low-pitched beep
2x high-pitched beep
Meaning/headphones
are switched on
are switched off
are connected via Bluetooth
are not connected via Bluetooth
are in Bluetooth pairing mode
Incoming call rejected
Call ended
Rechargeable battery has the
stated charge level
Rechargeable battery is empty.
Recharge the headphones.
Meaning/headphones...
minimum volume is reached
maximum volume is reached