Features: TX16 is a bluetooth-compatible adapter with optical fiber, 3.5mm bluetooth-compatible transmitter-receiver 2 in 1 . Two devices can be connected at the same for time. When it is used as a Bluetooth-compatible transmitter, it can wirelessly transmit music from mobile phones, walkmans, TVs, computers and other devices to your Bluetooth-compatible receiver. Suitable for stereo Bluetooth-compatible headsets, Bluetooth-compatible speakers and other devices. Specifications: Product Name: TX16 Bluetooth-compatible Version: V5.0, Class II Bluetooth-compatible Chip: CSR BC8670 Frequency Range: 2.402GHZ-2.480GHZ Bluetooth-compatible Protocol: RX: A2DP AVRCP TX: A2DP Receiving Mode: support (one for two functions, even two mobile phones) CODEC: Sort TX: Respectively: First: APT-X, Second: SBC, Third: APTX-LL, Fourth: FastStream RX: SBC Note for APTX use: APT-X 48KHZ codec is first supported in single connection (headphones or speakers must also support APT-X) If it is dual connection, SBC CODEC will be automatically switched. Battery Specification: 350MA Rechargeable lithium battery Charging Power Supply: 110-240V AC Adapter 5VDC 300mA Working Temperature: -1055 degrees Working Jours: AUX: 15 hours SPDIF: 12 hours Weight with Packaging: 118g Product Size: approx 60x60x20mm/2.36x2.36x0.79in Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. When the battery voltage is lower than 3.1V, it will automatically shut down. In the absence of a paired device, it will automatically shut down after 5 minutes. Package includes: 1pcx TX16 host 1pcx Fiber optic cable 1pcx Audio Line 1pcx Charging Cable 1pcx Manual