NOTE:  Its because of For sony's Wireless headset/earphone/headphone uses a special encoding method, its not public for other devices to connect.So when you use For sony's Wireless headset/earphone/headphone to pair with our devices in Wireless transmitter mode, it may takes longer time to pair.The pairing time varies on different model of For Sony . But they can surely pair successfully with our devices.

• Suitable for any devices(smartphone,earphone,speaker etc) any version of Wireless on the market, including: BT 1.0/1.1/1.2//2.0/2.1/3.0/3.1/3.2/4.0/4.1/4.2/5.0 etc.

• World’s First aptX HD in Both TX / RX Mode: Powered by premium CSR8675 chipset, VIKEFON Wireless adapter supports  the latest BT V5.0 , whereas most of others on Aliexpress are only equipped with CSR8670 chip and support BT V4.1, V4.0 or even V3.0. With aptX HD, our Wireless transmitter / receiver can stream stable audio and deliver CD-quality sound wirelessly over Wireless connections.

• Real-Time Audio Transmission: VIKEFONWireless transceiver adopt the aptX Low Latency Technology in both TX & RX modes, which can reduce audio lag under 40ms and let you enjoy high-quality audio in sync with the picture (Your Wireless headphones or speaker must also support aptX LL / aptX as well.)

• Long Battery Life: Internal battery provides Wireless adapter for more than 24 HOURS of use after 3 hours charging time. It also supports charging and streaming simultaneously.

• OPTICAL+RCA+3.5MM: Apart from 3.5mm Aux / RCA connection, VIFEFON Wireless Adapter also supports optical cable(TOSLINK /SPDIF) input / output. With provided optical cable, you can enjoy high-quality digital sound through multiple audio outputs, such as wired stereo, speakers, or headphones.

• Under TX mode, two Wireless headphones can be paired at once so parents can watch in silence and give children a needed break; Under RX mode, two smart devices can be paired for playing different songs. Record 8 devices and automatically re-pairing with existing paired devices.

• Auto-Turn OFF: In RX or TX mode, The BT-B19 will automatically power off if there is no devices to be connected within 10 minutes.

• Pair with Each Other: Support work with each other, One as a transmitter, the second - as a receiver.

Technical specifications:

• BT version: V5.0, Class II

• Battery: 600mAH rechargeable lithium battery

• Net weight: about 45 g

• Size: 63 x 63 x 20mm

• Operating time in receiver mode: 22 hours

• Operating time in transmitter mode: 26 hours

• Charging time: 3 hours

• Transmission range: within 10 m

• Audio coding:

• TX: aptX HD, aptX Low latency, aptX, SBC

• RX: aptX HD, aptX Low latency, aptX, SBC, ACC

Package contents:

• 1 x Wireless Transmitter/Receiver Adapter

• 1 x Micro USB charging cable

• 1 x 3.5mm audio cable

• 1 x 3.5mm jack to 2 RCA plug cables

• 1 x Digital Optical Toslink Audio Cable

• 1 x user manual

Notes: 

• Charging is necessary for first use. It can be fully charged for about 3 hours. The LED lights up red during charging and turns off when it is fully charged. 

• The optical terminal and AUX terminal can not be used at the same time. Please note that digital output can not be done simultaneously when digital input.

• In order to use aptX HD and aptX LL, your Wireless headphones and speakers need to have aptX HD and aptX LL function. Otherwise, codec will automatically be aptX or SBC.