2pc Wireless Voice Bidirectional Caller

Specifications: Power Supply Method: polymer lithium battery 1800mAh Battery Powered: DC5V/1A Working Temperature: -20 C to 55 C Transmission Distance: Approximately 1000 meters of open space, 20-100 meters of partition walls, floors 1-8 Working Frequency: B-gear frequency 462MHz ...Specifications: Power Supply Method: polymer lithium battery 1800mAh Battery Powered: DC5V/1A Working Temperature: -20 C to 55 C Transmission Distance: Approximately 1000 meters of open space, 20-100 meters of partition walls, floors 1-8 Working Frequency: B-gear frequency 462MHz A-gear frequency 434MHz Working Time: Charge once for about 1 week Charging Time: Approximately 5 hours when fully charged Standby Time: 3-5 days Sound Adjustment: 3rd gear adjustable Music Ringtones: 38 ringtones Ring Volume: Level 3 adjustment (standby machine volume adjustment key) Call Sound: Level 3 adjust call size (adjust volume key during call operation)