Tenda D301-V2 User Manual page 108

2) Never place the device near to metal objects or in direct sunshine.
3) Keep it far away from devices that use the 2.4 GHz radio wave frequency to transmit and receive data, such as
802.11g/n wireless network devices, electronic devices such as cell phones, radio transmitters, blue tooth, cordless
phones, fax machine, refrigerator and microwaves to avoid electronic interference.
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Wireless Modem Router