Specification: Bluetooth version- V3.0 EDR Frequency range- 2.4~2.48GHZ Operation distance- 0-10m Talk time- 15~16 hours Standby time -Up to 1000 hours Charging time -2~3 hours Power Supply- Lithium battery Material -ABS Special function - HD Voice; Automatic shutdown after away from the car; Connect two phones at the same time; Smart dialing; Ultra-long standby time; DSP noise reduction; Max memory 8 Cellphones‘ connection. Package weight -0.2 kg Product size -(L x W x H) - 4.5 x 11.8 x 1.4 cm Package size -(L x W x H)- 15 x 9 x 4 cm   Package contents- 1 x Clip, 1 x USB Cable, 1 x Car Charger, 1 x Lithium Battery, 1 x Speakerphone