Features:-This is a handsfree steering wheel bluetooth speakerphone, can connect two phones at the same time. With it, answering a call when driving becoms easy and convenient.-Built-in DSP noise suppression and with the echo cancellation functions.-Equipped with high-fidelity 2W speakers and high-sensitivity microphone.-Long standby time, up to 1000 hours. And the working time is up to 17 hours.-The offered USB cable and car charging adaptor can be used to charge the host, also you can use them to charge your mobilephone.-Very easy to install, all the tools needed are offered within the retail box, you can change the degree of tightness of the set collar or use the non-slip mat to fix the host to your steering wheel perfectly.Specifications:Bluetooth Version: 3.0 + EDRWorking Frequency Range: ISM 2.4 GHz to 2.48GHzWireless Distance: 0 ~ 10 metersCharger Output: DC 5 ~ 6V 400mABattery Type: Lithium-Ion battery, 3.7v, 650mah (#BL-5B)Charging Time: about 3 hoursHand-free Working Time: about 17 hoursStandby Time: about 1000 hoursDevice Dimension: 8.4cm(L) * 4.6cm(W) * 1.2cm(H)Package Include:1 x Speakerphone1 x USB cable1 x Car Adaptor1 x Set Collar1 x Turnscrew1 x Accessory for Set Collar2 x Non-slip mat1 x User manual