Avantalk BTCK-20 Bluetooth Visor Handsfree Wireless Text-To-Speech (TTS) Speakerphone (Titanium) Avantalk BTCK-20 Bluetooth Hands Free Car Kit with Caller ID Announcement (Avantronics) General Features: Text-To-Speech with Caller ID announcement Bluetooth V2.0 + EDR BlueCore 5 CSR Chip Class 2,10 meters Support headset and hands free profiles Talk time: Up to 10 hours Standby time: Up to 25 days Charging time: 2-3 hours Battery: 650mAH rechargeable lithium polymer battery