Wired Doorbell Battery-mounted

Wired Doorbell Battery-mounted , Dingdong Doorbell Access Control Accessories , WIRED DOORBELL BATTERY-MOUNTED DINGDONG DOORBELL ACCESS CONTROL ACCESSORIES , Power type: DC/AC , Scope of Application: hotels, hotels, families ,  87*62 * 23mm ,  the 12V power supply is directly connected , 120 decibels volume, clear ringtones, promptly remind you that there are guests visiting , Exquisite appearance and stable performance , It is applicable to sewage in me~dical, laboratory, o~ral clinic, beauty institution and pet clinic , This product uses Corona discharge to extract ozone in the air. Add ozone into the required disinfe~ction and sterili~zation through air pump and blasting tool, so that ozone concentration in the water reaches and gets disinfec~tion and sterili~zation effect , No noise, no secondary pollution,long service life, advanced technology, high automation,no duty, good treatment effect,takes up small floor space, convenient operation management and other advantages , Product is designed and produced according to required sewage discharge standard of environmental protection department