Blaupunkt WM40U Owner's Manual page 9

inner battery in case no use for long time.
b. Please do not use the microphone face to speaker, which will cause
big noise.
Trouble shooting
1. Cannot power on microphone or wireless receiver
a. Please check if the battery power was installed properly.
b. Please check if the battery power was exhausted.
c. Please contact service center if the issue still remains.
2. Noise or distortion when we talk to microphone
a. Please try to reduce the microphone output volume from your audio
device due to overload.
b. Please take the microphone a bit far away for the speaker for talking.
c. Please contact service center if the issue still remains.
Specification
Distance between transmitter and receiver: >10m
Type of frequency band: UHF
Frequency response: 65Hz–18kHz
Signal-to-Noise(S/N) ratio: >85 dBA
UHF frequency band: 640-647.5MHz
THD: <0.3%,
Transmitter transmitting power: <10 mW,
Receiver input: 1/4" (6.3 mm) unbalanced
Receiver maximum Output Level: 120 dBV,
Receiver rechargeable Battery: Lithium-ion 3.7V, 1200 mAh
Receiver charge time: 2-3 hours @5V/1A
Receiver battery Playtime: Up to 7 hours
Microphone battery: 2 x AA alkaline (included)
Microphone battery Playtime: Up to 3 hours
Microphone wireless transmission distance: 40meters max.
Receiver power source: DC 5V/1A.
Dimensions and Weight
Dimensions (W x H x D):
Microphone 230 x 49 x49 mm
Receiver：25 mm x 56mm x 120 mm
Weight: Microphone 155 g(without battery)
Receiver: 72 g
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