Interphone convention safeguards: 　　
After １ , interphone is used for a long time, press be good at, control knob and housing are very easy soil, get off from interphone please control knob, use neuter lotion (do not use strong caustic chemical drug) with housing of Shi Buqing clean. Use such as is divided corrupt the damage that the chemical such as agent of agent, alcohol, sparge or oil preparation causes interphone surface and case possibly. 　　
2, take interphone of put down gently gently, do not carry aerial shift interphone. 　　
3, when not applicable accessory, ask the dust cover on the lid (if have equipment) .