Essager BT001 Bluetooth 5.0 Audio Receiver 3.5mm Jack AUX Handsfree Call Car Wireless Music Adapter for Headphones Features: 1. Bluetooth version 5.0 is adopted, with better compatibility, stability and response speed than the previous version. 2. Collar clip design, exquisite and small, light weight. 3. The receiver is connected to a mobile phone via Bluetooth. When you insert your wired earphones' plug into the 3.5mm jack on the reciver, your wired earphones become a pairs of wireless earphones. 4. The Bluetooth receiver can also connect the audio adapter to the automobile aux interface to the car audio equipment. 5. Can connect to 2 mobile phones at the same time, and freely switch between the two mobile phones. 6. Compatible with OMTPand CTIA earphone plug. 7. The built-in HD noise reduction microphone supports call answering, music playing, pause, volume adjustment, previous/next song. 8. Built in 110mAh polymer battery, 2 hours charge cycle allows for 4-5 hours use. Specifications: Brand: Essager Model: BT001 Color: Black Output interface: 3.5mm jack Bluetooth version: 5.0 Bluetooth protocol: AVRCP, A2DP, HFP, HSP Signal to noise ratio: ＞90dB Mic sensitivity: ± 42dB Frequency response: 20Hz-20kHz Transmission distance: 10m Output power: 11mw RL = 16 Ω Battery capacity: 110mAh Charging time: 2 hours Battery life: 4-5 hours Product size: 52 * 16.5 * 12mm/4.72*0.65*0.47" Product net weight: 20g Notes: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools. 2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Package included: 1 X Bluetooth Audio Receiver 1 X Audio Adapter 1 X Charging Cable