Features: BT5.1 receiver, high-performances bluetooth-compatible chip, stable signal with low latency, stable and smooth connection, supporting long-distance transmission of 10 meter. Intelligent noise reduction, hands-free calls, clear listening even in noisy environments, lossless sound quality, support for WAV, FLAC, APE lossless formats, built-in operational design, bringing you a better experience. Insert and play, capable of connecting headphones, speaker, phones, tablets, laptops, etc. Equipped with a 250mAh rechargeable lithium battery, it can be charged for 1 hour and can be used continuously for about 20 hours. Support TFcard, LED digital display screen, clear battery level at a glance. Strong back clip design, lightweight and easy to carry, suitable for multiple scenarios, such as fitness, driving, leisure and entertainment. Specifications: Material: ABS Color: Black Size: Approx. 58.6x28x15mm/2.31x1.1x0.59inch Model: GR13 Bluetooth-compatible Version: BLE5.1 Battery Capacity : 250mAh Charging Time: about 1h Working Time: about 20hrs Transmission Distance: about 10m/32.8ft Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1x GR13 Receiver