Best Buy: JBL Clip 2 Portable Bluetooth Speaker Gray JBLCLIP2GRYAM
JBL Clip 2 review: Tiny Bluetooth speaker improves with full waterproofing, boosted battery life - CNET
Amazon.com: JBL Clip 4 - Portable Mini Bluetooth Speaker, big audio and punchy bass, integrated carabiner, IP67 waterproof and dustproof, 10 hours of playtime, speaker for home, outdoor and travel - (Squad) : Electronics