Voice Intercom Doorbell Wireless Doorbell 1-8 Floors Two-way Intercom Ultra-long Standby Wireless Distance 1000 Meters Features: 1. The actual distance is 1000 meters. The first floor to the eighth floor 2. The appearance is thin and the thickness is 18mm. Similar products on the market are than 22mm thick. It feels good to hold them 3. The battery is a 2000mA lithium battery. The external unit and the indoor unit are both real 2000mA batteries. The external unit works normally. Press five times a day, talk for two minutes at a time, work for about 8 months, and the indoor unit works for about 1 week, 4. The keys are made of plastic+silicone structure, and the surface is made of high-gloss technology, which has a super . Compared with the counterparts, the keys are made of all-rubber, which has no grade and feel. 5. Intelligent and humanized design, with intercom light and power light display, customers can see at a glance 6. For two indoor units, press key and the other indoor unit rings . Press the TALK key to directly talk to each other, and use it as an intercom 7. The external unit charging stand needs to be removed from the rain cover and placed on the charging stand for charging 8. On key - gear 0 - means off gear A - gear A frequency B - gear B frequency In case of interference during the call, the external unit and the indoor unit to A or B at the same time Product Product parameters: Power supply mode: both the outdoor unit and the indoor unit are rechargeable lithium batteries Working temperature: - 20 ~55 Transmission distance: about 1000 meters open, 20-100 meters partition, 1~8 floors Working frequency: gear B frequency 462MHz gear A frequency 434MHz Working time: the outdoor unit is charged for about 8 months, and the indoor unit is charged for about 1 week Charging time: about 5 hours Music ringtones: 38 ringtones Ring volume: 3 of adjustment (volume key for standby machine) Call sound: adjust the call size at (adjust the volume key when calling) Host size: host size of outdoor unit and indoor unit: 116 * 56 * 18mm Size of cover: 121.5 * 61.5 * 31.3mm Charging stand size: 70 * 56 * 29mm Products include: 1x doorbell, 1x receiver