I am an Chinese seller,providing customers with high-quality and low-cost products. The types of products we sell include Home & Kitchen,Health & Beauty,Fashion Clothing,Electronics,Watches & Jewelry,and so on. We keep up with the most popular fashion trends. If you like our products, please follow us and become our followers and fans. Sincerely at your service .Please feel free to contact us if you have any questions. Specifications: This device supports audio devices with audio input for wireless audio reception and transmission. It supports automatic search and connection with Bluetooth devices to realize wireless audio transmission. Built-in enhanced signal transmission circuit make the connection faster and more stable. Automatic memory connection function provides more convenient operation and more convenient connection. Built-in battery has long battery life for low power consumption. It has smart compatibility for Android/for iOS system mobile phones, and all Bluetooth audio devices. The connection is simple, without complicated APP driver and download. Item Name: Bluetooth Transmitter & Receiver Adapter Bluetooth Version: 5.0 Microphone: Built-in Microphone (RX mode supports hands-free calling) Bluetooth Protocol: EDR, A2DP, HSP, AVRCP Frequency: 2.4GHz-2.48GHz Bluetooth Transmission Distance: ≤10 meters Bluetooth Receiving Distance: ≤10 meters Bluetooth RX Mode: Connect a Mobile Phone Bluetooth TX Mode: Connect 2 Bluetooth Headsets/Speakers Simultaneously Charging Voltage: DC 5V Battery: 300mAh Battery (Included) Working Time: about 6H Material: ABS Size: 65.9mm x 47.9mm x 13.3mm/2.59" x 1.89" x 0.52" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bluetooth Transmitter & Receiver Adapter 1 x 3.5mm Audio Cable 1 x Charging Cable 1 x User Manual a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a