Bluetooth intercom TK-X4

Bluetooth version: 5.1
Standby time: 500 hours
Working time: 40 hours
Charging time: about 3 hours
Charging interface: TYPE-C interface
Power requirement: 5V 1A
Battery type: rechargeable lithium polymer battery
Working temperature: 14 °F~122 °F (-10 °C~50 °C)
Storage environment: 5 °F~131 °F (-15 °C~55 °C)