Teleheer T6 Plus Features: Two-way talks simultaneously, automatic phone answering. Specifications: Intercom distance: 1500M Wireless version: Bluetooth 5.1 Support Bluetooth protocol: A2DP, AVRCP, HS/HF Port: Type_C Stand-by time: 500 hours Working time: 30 hours Battery: 850mA Charging time: 2.5 hours Charging voltage: 5V Horn diameter: 40MM Frequency range: 2.402GHZ-2.480GHZ Temperature range: -40~60�ºC Body material: ABS/PVC plastic Size: 101*54*20.5MM Accessories: base clip*1, earphone*1, soft microphone*1, hard microphone*1