1. INDOOR RECEIVER: RECHARGEABLE LI-ION BATTERY, OUTDOOR BELL: AAX 3 PCS

2. DISTANCE: AROUND 50M (OPEN AREA)

3. BELL VOLUME: 3-LEVEL

4. POWER: 0.3W, WEIGHT: INDOOR RECEIVER(110X54X20MM)(85G) OUTDOOR BELL(68X70X26.4MM)(60G)

5. 1 OUTDOOR BELL CAN LINK 3 INDOOR RECEIVERS, 1 INDOOR RECEIVER CAN LINK 2 OUTDOOR BELLS

6. GET VIDEO INSTRUCTION ON YOUTUBE

7. EASY INSTALLATION